Equity Compensation - Stock Options Granted and Exercised (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares subject to stock options granted	0	0	121,208	168,500
Weighted average grant date fair value per share	$ 0.00	$ 0.00	$ 3.65	$ 12.62
Shares subject to stock options exercised	0	0	0	0
Intrinsic value of stock options exercised	$ 0	$ 0	$ 0	$ 0
Proceeds received from stock options exercised	0	0	0	0
Tax benefits realized from stock options exercised	$ 0	$ 0	$ 0	$ 0