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Adoption of Amended Guidance Impact on Previously Reported Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Statement:      
Income taxes $ 13,676 $ 15,508  
Net income $ 33,768 $ 34,174  
Diluted earnings per share $ 0.71 $ 0.71  
Diluted weighted-average common shares outstanding 32,679,806 32,537,225  
Balance Sheet:      
Paid-in capital $ 574,954   $ 592,350
Cash Flow Statement:      
Net cash provided by operating activities 34,317 $ 41,852  
Net cash used in financing activities $ (38,929) (41,638)  
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)