Capital Stock - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended							1 Months Ended	3 Months Ended
	Aug. 29, 2012	Nov. 30, 2007	Dec. 31, 2013 Vote	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Treasury Stock	Dec. 31, 2012 Treasury Stock	Dec. 31, 2011 Treasury Stock	Dec. 31, 2013 Series A Junior Participating Preferred Stock Vote	Aug. 29, 2012 Series B Cumulative Perpetual Convertible Preferred Stock	Dec. 31, 2013 Series B Cumulative Perpetual Convertible Preferred Stock
Components Of Common Stock [Line Items]
Authorized capital, shares			243,000,000
Common stock, par value			$ 0.01	$ 0.01
Common stock, shares authorized			240,000,000	240,000,000
Preferred stock, shares authorized			3,000,000	3,000,000					240,000
Common Stock, Voting Rights			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.
Preferred stock dividend rate percentage	7.50%									7.50%
Common stock, votes per share			1
Preferred stock, votes per share									1,000
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
Stock repurchase program, authorized amount		$ 100,000,000
Acquisition of Treasury Stock (in shares)						56,000	122,000	227,000
Treasury Stock Acquired, Average Cost Per Share			$ 6.50
Acquisition of treasury stock			$ (364,000)	$ (783,000)	$ (1,587,000)	$ (364,000)	$ (783,000)	$ (1,587,000)
Redemption of preferred stock (in shares)											300