Quarterly report pursuant to Section 13 or 15(d)

Geographic Information (Details)

v2.4.1.9
Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Segment Reporting Information [Line Items]          
Revenue $ 1,538,871us-gaap_Revenues $ 1,488,691us-gaap_Revenues $ 2,992,337us-gaap_Revenues $ 2,984,716us-gaap_Revenues  
Inventories 143,111us-gaap_InventoryNet   143,111us-gaap_InventoryNet   150,944us-gaap_InventoryNet
Restricted and Nonrestricted Inventory, Net 223,771amrk_RestrictedandNonrestrictedInventoryNet   223,771amrk_RestrictedandNonrestrictedInventoryNet   175,554amrk_RestrictedandNonrestrictedInventoryNet
Assets 373,938us-gaap_Assets   373,938us-gaap_Assets   305,138us-gaap_Assets
Long term assets 11,347us-gaap_NoncurrentAssets   11,347us-gaap_NoncurrentAssets   9,815us-gaap_NoncurrentAssets
United States          
Segment Reporting Information [Line Items]          
Revenue 1,345,428us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
1,256,344us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
2,658,914us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
2,556,790us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
 
Inventories 201,825us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= country_US
  201,825us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= country_US
  159,145us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= country_US
Assets 350,982us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_US
  350,982us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_US
  285,092us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_US
Long term assets 11,267us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
  11,267us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
  9,726us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
Europe          
Segment Reporting Information [Line Items]          
Revenue 64,460us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
121,760us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
119,410us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
192,064us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Inventories 9,475us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  9,475us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  10,500us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Assets 10,485us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  10,485us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  14,137us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Long term assets 80us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  80us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  89us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
North America, excluding USA          
Segment Reporting Information [Line Items]          
Revenue 110,057us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
100,502us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
181,836us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
177,268us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
 
Inventories 3,846us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
  3,846us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
  4,091us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
Assets 3,846us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
  3,846us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
  4,091us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= amrk_NorthAmericaexcludingUSAMember
Asia Pacific          
Segment Reporting Information [Line Items]          
Revenue 18,732us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
9,206us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
30,044us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
56,533us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
 
Africa          
Segment Reporting Information [Line Items]          
Revenue 25us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
25us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
 
Australia          
Segment Reporting Information [Line Items]          
Revenue 167us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_AU
879us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_AU
2,106us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_AU
2,029us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_AU
 
South America          
Segment Reporting Information [Line Items]          
Revenue 2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
32us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
 
Asia          
Segment Reporting Information [Line Items]          
Inventories 8,625us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
  8,625us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
  1,818us-gaap_InventoryNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Assets $ 8,625us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
  $ 8,625us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
  $ 1,818us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember