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Adoption of Amended Guidance Impact on Previously Reported Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement:          
Income taxes $ 35,112   $ 38,988 $ 50,620 $ 53,319
Net income $ 64,621   $ 65,423 $ 90,158 $ 88,471
Diluted earnings per share $ 1.82   $ 1.85 $ 2.54 $ 2.51
Diluted weighted-average common shares outstanding 32,606,336   32,477,262 32,576,326 32,454,298
As Reported          
Income Statement:          
Income taxes   $ 15,508      
Net income   $ 34,174      
Diluted earnings per share   $ 0.71      
Diluted weighted-average common shares outstanding   32,537,225      
Balance Sheet:          
Paid-in capital   $ 610,285      
Cash Flow Statement:          
Net cash provided by operating activities   41,852      
Net cash used in financing activities   (41,638)      
As Adjusted          
Income Statement:          
Income taxes   14,654      
Net income   $ 35,028      
Diluted earnings per share   $ 0.74      
Diluted weighted-average common shares outstanding   32,546,314      
Balance Sheet:          
Paid-in capital   $ 609,431      
Cash Flow Statement:          
Net cash provided by operating activities   42,706      
Net cash used in financing activities   $ (42,492)