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Oman Investment (Details)
Mar. 31, 2015
Jun. 30, 2012
USG-Zawawi Drywall LLC    
Statement [Line Items]    
Ownership percentage by parent in noncontrolling interest 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= usg_UsgZawawiDrywallLlcMember		  
Percentage of noncontrolling owners in VIE 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= usg_UsgZawawiDrywallLlcMember		  
Zawawi Gypsum LLC    
Statement [Line Items]    
Ownership percentage by parent in noncontrolling interest   55.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= usg_ZawawiGypsumLlcMember