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v3.6.0.2

Adoption of Amended Guidance Impact on Previously Reported Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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.

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