Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Equity [Abstract]
Stock repurchase program, authorized amount			$ 50,000,000
Repurchased shares	10,875	0	616,294	0
Repurchased shares, value	109,000		7,000,000
Stock repurchase program, average cost	$ 10.03		$ 11.34
Stock repurchase program, remaining available repurchase amount			$ 12,400,000