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Income Taxes - Balance Sheet Classification of Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Unrecognized tax benefits $ 26,463us-gaap_UnrecognizedTaxBenefits $ 40,478us-gaap_UnrecognizedTaxBenefits $ 27,734us-gaap_UnrecognizedTaxBenefits $ 29,128us-gaap_UnrecognizedTaxBenefits
Accrued expenses        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits 295us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		 3,348us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		 1,427us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		  
Other long-term liabilities        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits $ 26,168us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 $ 37,130us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 $ 26,307us-gaap_UnrecognizedTaxBenefits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember