Shareholders' Equity - Additional Information (Detail) - $ / shares		12 Months Ended
	Dec. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2013
Equity [Abstract]
Number of shares authorized to repurchase			1,000,000		1,000,000
Number of shares of common stock repurchased	0		852,100,000	147,900,000
Average price of shares repurchased			$ 11.41	$ 14.82
Preferred stock, shares authorized		1,000,000	1,000,000
Preferred stock, shares outstanding		0	0
Common stock, shares authorized		20,000,000	20,000,000
Common stock, shares issued		14,019,000	14,012,000
Shares surrendered in exchange for payment of taxes		580	1,020	994
Average fair value of shares		$ 4.86	$ 13.49	$ 14.99