Stockholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 22, 2014	Nov. 01, 2007
Equity [Abstract]
Stock repurchase program, authorized amount					$ 50,000,000
Stock repurchase program, additional authorized amount				$ 30,000,000
Repurchased shares		1,527,647	0
Repurchased shares, value	$ 0	$ 15,000,000
Stock repurchase program, average cost		$ 9.82
Stock repurchase program, remaining authorized repurchase amount	$ 34,400,000