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Share-Based Compensation (Details Textual)
 3 Months Ended
Mar. 31, 2015
MSUs  
Share Based Compensation [Abstract]  
Vesting period 3 years
Minimum of range for number of shares earned 0.00%usg_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAwardMinimum
/ us-gaap_AwardTypeAxis
= usg_MarketShareUnitsMember
Maximum of range for number of shares earned 150.00%usg_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAwardMaximum
/ us-gaap_AwardTypeAxis
= usg_MarketShareUnitsMember
Performance Shares  
Share Based Compensation [Abstract]  
Vesting period 3 years
Minimum of range for number of shares earned 0.00%usg_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAwardMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Maximum of range for number of shares earned 200.00%usg_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAwardMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember