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Income Taxes - Summary of Reconciliation of the Income Tax Expense at the Statutory Income Tax Rate and the Effective Tax Rate for Income from Continuing Operations before Income Taxes (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax at the US statutory federal rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential