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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]      
Expiration year of lease agreements 2029    
Rent and related expense $ 15,800,000us-gaap_OperatingLeasesRentExpenseNet $ 14,300,000us-gaap_OperatingLeasesRentExpenseNet $ 14,800,000us-gaap_OperatingLeasesRentExpenseNet
Sublease rental income $ 0us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue $ 0us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue $ 0us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Royalty license expiration year 2023