Equity Compensation Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Pre-tax compensation expense for unvested stock-based compensation grants	$ 2,900		$ 2,900
Service period applicable to the grantees on a weighted-average basis, years			1 year 7 months 6 days
RSUs vested and settled in shares of common stock, amount	$ 787	$ 123	$ 886	$ 1,383