Stockholders' Equity and Redeemable Instruments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Mar. 13, 2015	Dec. 11, 2014	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Statement Of Shareholders Equity [Line Items]
Preferred stock, shares authorized				5,000,000		5,000,000
Preferred stock, shares issued				0		0
Preferred stock, shares outstanding				0		0
Common stock, par value				$ 0.01		$ 0.01
Common stock, shares authorized				100,000,000		100,000,000
Common stock, shares issued				31,982,888		32,135,176
Common stock, shares outstanding				31,366,328		31,484,774
Treasury stock, shares				616,560		650,402
Share repurchase, amount				$ 6,100	$ 5,283
IBS [Member]
Statement Of Shareholders Equity [Line Items]
Common Stock Repurchase, Shares	315,000		315,000
Share repurchase, amount			$ 6,100
Share repurchase, price per share	$ 19.23
Discount from last reported price of our common stock	7.50%
Cetus Capital II, LLC [Member]
Statement Of Shareholders Equity [Line Items]
Common Stock Repurchase, Shares					300,000
Share repurchase, amount					$ 5,300
Share repurchase, price per share		$ 17.61