Shareholders' Equity - Additional Information (Detail) - $ / shares		12 Months Ended
	Dec. 31, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Apr. 30, 2013
Statement Of Shareholders Equity [Line Items]
Preferred stock, shares authorized		1,000,000	1,000,000
Preferred stock, shares outstanding		343,000	0
Preferred stock, par value		$ 1.00	$ 1.00
Common stock, shares authorized		20,000,000	20,000,000
Common stock, shares issued		14,019,000	14,019,000
Number of shares authorized to repurchase				1,000,000	1,000,000
Number of shares of common stock repurchased	0			852,100,000
Average price of shares repurchased				$ 11.41
Shares surrendered in exchange for payment of taxes		718	580	1,020
Average fair value of shares		$ 3.76	$ 4.86	$ 13.49
Series A Preferred Stock [Member]
Statement Of Shareholders Equity [Line Items]
Preferred stock, shares outstanding		343,000	0
Preferred stock, par value		$ 1.00
Preferred stock, dividend rate		9.00%
Preferred stock, liquidation preference per share		$ 25.00
Preferred stock, dividend rate		2.25
Preferred stock, redemption price per share		$ 25.00
Preferred stock, redemption period		120 days
Period of time for listing		180 days