Equity Compensation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Pre-tax compensation expense for unvested stock-based compensation grants	$ 12,300		$ 12,300
Service period applicable to the grantees on a weighted-average basis, years			1 year 8 months 12 days
RSUs vested and settled in shares of common stock, amount	$ 563	$ 49	$ 2,505	$ 1,226