Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Stock repurchase program, authorized amount	$ 50,000,000
Repurchased shares	0	1,054,538	1,139,997
Repurchased shares, value		5,721,000	6,450,000
Stock repurchase program, average cost		$ 5.43	$ 5.66
Stock repurchase program, remaining repurchase Amount	$ 19,400,000