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Income Tax (Provision) Benefit - Summary of Deferred Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Deferred tax assets:  
Reserves for expected costs of liquidation $ 10,990ck0000040730_DeferredTaxAssetsReservesForExpectedCostsOfLiquidation
Net operating and capital loss carryovers 108,720us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Gross deferred tax assets 119,710us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance (79,762)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax asset, net of valuation allowance 39,948us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:  
Fair value in excess of tax basis of holdings of New GM Securities (38,539)ck0000040730_DeferredTaxLiabilityFairValueInExcessOfTaxBasisOfSecurities
Other (1,409)us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liabilities (39,948)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet