Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Total rent expense and related taxes and operating expenses, under operating leases	$ 3,880	$ 3,910
Tax reserves, non-income tax related	$ 647		$ 659