Other Non-Current Liabilities - Components of Other Non-Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Accrued salaries and employee benefits	$ 22,891	$ 32,690
Premise related costs	17,601	17,790
Accrued earnout payments	1,936	788
Other	1,203	1,269
Total other non-current liabilities	$ 20,740	$ 19,847