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Shareholders' Equity - Summary of Unvested Restricted Stock Awards and Restricted Stock Units (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of Shares, Ending Balance 882,663      
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [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, Forfeitures 0 0 0  
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, Forfeitures 0 0 0  
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
Weighted-average Remaining Vested Period, Granted 6 months 11 days 5 months 1 day 5 months 5 days  
RSUs [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [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, Forfeitures (89,889) (126,368) (90,332)  
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, Forfeitures 19.03 16.82 14.58  
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