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Capital Stock (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
shares
Dec. 31, 2015
USD ($)
votes_per_share
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
shares
Components Of Common Stock [Line Items]        
Authorized capital, shares   243,000,000    
Common stock, par value | $ / shares   $ 0.01 $ 0.01  
Common stock, shares authorized   240,000,000 240,000,000  
Preferred stock, shares authorized   3,000,000 3,000,000  
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.    
Common stock, votes per share | $ / shares   $ 1    
Stock repurchase program, authorized amount | $   $ 50,000,000    
Stock repurchased, average cost per share | $ / shares   $ 9.03    
Acquisition of treasury stock | $   $ (1,960,000) $ (1,013,000) $ (364,000)
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $   $ 47,027,000    
Treasury Stock        
Components Of Common Stock [Line Items]        
Acquisition of treasury stock (in shares)   217,000 133,000 56,000
Acquisition of treasury stock | $   $ (1,960,000) $ (1,013,000) $ (364,000)
Series B Cumulative Perpetual Convertible Preferred Stock        
Components Of Common Stock [Line Items]        
Redemption of preferred stock (in shares) 300   300  
Seriesa Junior Participating Preferred [Member]        
Components Of Common Stock [Line Items]        
Preferred stock, shares authorized   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 | votes_per_share   1,000