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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Total rent expense and related taxes and operating expenses, under operating leases $ 2,176us-gaap_LeaseAndRentalExpense $ 2,090us-gaap_LeaseAndRentalExpense  
Tax reserves, non-income tax related $ 652us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent   $ 659us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent