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Capital Stock - (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Nov. 27, 2013
Feb. 26, 2013
Class of Stock [Line Items]        
Number of shares repurchased   1,491,187    
Value of share repurchased   $ 24,595,000    
Common Stock Repurchased Since Announcement Of Strategic Initiative 3,493,332      
Value Of Common Stock Repurchased Since Announcement Of Strategic Initiative $ 54,159,000      
Maximum percentage of shares repurchased under strategic initiative 20.00%      
Maximum number of shares repurchased under strategic initiative 7,000,000      
Stock Options [Member]        
Class of Stock [Line Items]        
Options to purchase shares of common stock 1,687,000      
Weighted average exercise price $ 20.83      
Weighted average remaining contractual term 4 years      
Aggregate intrinsic value $ 156,000 $ 643,000    
Former Affiliated Entity [Member] | Stock Options [Member]        
Class of Stock [Line Items]        
Options to purchase shares of common stock 500,798      
Weighted average exercise price $ 28.62      
Weighted average remaining contractual term 1 year      
Aggregate intrinsic value $ 0      
6% Tangible Equity Units [Member]        
Class of Stock [Line Items]        
Interest rate percentage     6.00%  
Convertible Debt [Member]        
Class of Stock [Line Items]        
Interest rate percentage       3.75%
Preferred Stock [Member]        
Class of Stock [Line Items]        
Expiry date of rights Dec. 11, 2017