Capital Stock - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Vote $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) shares	Aug. 31, 2014 USD ($)
Components Of Common Stock [Line Items]
Authorized capital, shares (in shares)	243,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	240,000,000	240,000,000
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, voting rights description	The holders of common stock are entitled to one vote for each share of common stock on all matters submitted to a vote of the Company’s shareholders.
Common stock, votes per share | Vote	1
Stock repurchase program, authorized amount | $				$ 50,000,000
Stock repurchased, average cost per share (in dollars per share) | $ / shares	$ 8.99
Acquisition of treasury stock | $	$ 5,144,000	$ 1,960,000	$ 1,013,000
Amount remaining under repurchase authorization | $	$ 41,883,000
Treasury Stock
Components Of Common Stock [Line Items]
Acquisition of treasury stock (in shares)	572,000	217,000	133,000
Acquisition of treasury stock | $	$ 5,144,000	$ 1,960,000	$ 1,013,000
Seriesa Junior Participating Preferred
Components Of Common Stock [Line Items]
Preferred stock, shares authorized (in shares)	240,000
Preferred stock, voting rights description	each share of Series A Junior Participating Preferred Stock would entitle the holder thereof to 1,000 votes on all matters submitted to a vote of the shareholders of the Company
Preferred stock, votes per share | Vote	1,000