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Adoption of Amended Guidance Impact on Previously Reported Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement:                      
Income taxes                 $ 105,936 $ 104,677 $ 91,839
Net income $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 182,810 $ 172,929 $ 151,387
Diluted earnings per share $ 0.81 [1] $ 1.78 [1] $ 1.82 [1] $ 0.71 [1] $ 0.75 [1] $ 1.64 [1] $ 1.85 [1] $ 0.65 [1] $ 5.15 [1] $ 4.90 [1] $ 4.32
Diluted weighted-average common shares outstanding                 32,616,504 32,480,356 32,358,854
Balance Sheet:                      
Paid-in capital $ 592,350       $ 602,522       $ 592,350 $ 602,522  
Cash Flow Statement:                      
Net cash provided by operating activities                 277,756 221,383 $ 144,980
Net cash used in financing activities                 $ (213,916) $ (186,320) $ (120,207)
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)              
[1] Quarterly and year-to-date earnings per share are calculated on an individual basis; therefore, the sum of earnings per share amounts for the quarters may not equal earnings per share amounts for the year.