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Shareholders' Equity - Summary of Restricted Stock and Restricted Stock Unit Awards Held in the Irrevocable Trust (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of Shares, Ending Balance 882,663      
Restricted Stock [Member]        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of Shares, Beginning Balance 12,218 10,421 6,252  
Number of Shares, Granted 22,191 12,218 10,421  
Number of Shares, Vestings (12,218) (10,421) (6,252)  
Number of Shares, Ending Balance 22,191 12,218 10,421 6,252
Weighted-average Grant-date Fair Value, Beginning Balance $ 26.19 $ 24.23 $ 25.04  
Weighted-average Grant-date Fair Value, Granted 22.02 26.19 24.23  
Weighted-average Grant-date Fair Value, Vestings 26.19 24.23 26.13  
Weighted-average Grant-date Fair Value, Ending Balance $ 22.02 $ 26.19 $ 24.23 $ 25.04
Weighted-average Remaining Vested Period 6 months 11 days 5 months 1 day 5 months 5 days 1 month 24 days
Restricted Stock [Member] | Deferred Compensation Awards [Member]        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of Shares, Beginning Balance 277 1,502 5,901  
Number of Shares, Granted 0 0 0  
Number of Shares, Vestings 0 (1,225) (4,399)  
Number of Shares, Ending Balance 277 277 1,502 5,901
Weighted-average Grant-date Fair Value, Beginning Balance $ 9.56 $ 13.51 $ 19.60  
Weighted-average Grant-date Fair Value, Granted 0 0 0  
Weighted-average Grant-date Fair Value, Vestings 0 14.40 16.15  
Weighted-average Grant-date Fair Value, Ending Balance $ 9.56 $ 9.56 $ 13.51 $ 19.60
Weighted-average Remaining Vested Period 1 month 10 days 1 year 1 month 6 days 5 months 16 days 7 months 21 days
RSUs [Member]        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of Shares, Beginning Balance 1,988,912 1,903,334 1,667,411  
Number of Shares, Granted 372,547 374,939 827,562  
Number of Shares, Vestings (328,415) (162,993) (501,307)  
Number of Shares, Ending Balance 1,943,155 1,988,912 1,903,334 1,667,411
Weighted-average Grant-date Fair Value, Beginning Balance $ 17.06 $ 15.69 $ 15.72  
Weighted-average Grant-date Fair Value, Granted 23.44 24.71 18.94  
Weighted-average Grant-date Fair Value, Vestings 17.29 18.81 22.11  
Weighted-average Grant-date Fair Value, Ending Balance $ 18.06 $ 17.06 $ 15.69 $ 15.72
Weighted-average Remaining Vested Period 7 months 13 days 1 year 2 months 1 day 1 year 10 months 17 days 2 years 1 month 6 days
RSUs [Member] | Deferred Compensation Awards [Member]        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of Shares, Beginning Balance 495,470 235,364 185,340  
Number of Shares, Granted 26,549 294,843 127,977  
Number of Shares, Vestings (5,470) (34,737) (77,953)  
Number of Shares, Ending Balance 516,549 495,470 235,364 185,340
Weighted-average Grant-date Fair Value, Beginning Balance $ 20.79 $ 18.09 $ 18.68  
Weighted-average Grant-date Fair Value, Granted 23.73 24.82 16.40  
Weighted-average Grant-date Fair Value, Vestings 9.56 15.43 19.45  
Weighted-average Grant-date Fair Value, Ending Balance $ 21.10 $ 20.79 $ 18.09 $ 18.68
Weighted-average Remaining Vested Period 9 months 15 days 1 year 8 months 5 days 1 year 11 months 1 day 1 year 5 months 23 days