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Stock-Based Compensation Expense - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jul. 06, 2015 USD ($) shares | Dec. 31, 2016 USD ($) Employees $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of groups within the employee population | Employees |  | 2 |  |
Percentage of stock options granted to all other employees expected to vest |  | 72.00% |  |
Percentage of stock options granted to senior management expected to vest |  | 77.00% |  |
Estimated forfeiture rate for unvested options for senior management |  | 9.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management |  | 11.00% |  |
Increase In Compensation Expense Due To Revised Estimated Forfeiture Rates |  | $ 334,000 | $ 461,000 | $ 288,000
Weighted-average grant-date fair values of stock options granted | $ / shares |  | $ 12.65 | $ 14.35 | $ 15.97
Total intrinsic values of stock options exercised |  | $ 55,580,000 | $ 43,987,000 | $ 31,884,000
Total fair values of stock options vested |  | 18,114,000 | 16,227,000 | 11,627,000
Total unrecognized compensation expense related to non-vested stock options |  | $ 19,742,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Period for Recognition |  | 1 year 6 months 7 days |  |
Stock-based compensation expense |  | $ 20,558,000 | 21,274,000 | 15,158,000
Income tax benefit recognized related to stock-based compensation expense |  | 6,747,000 | 7,127,000 | 4,977,000
Compensation expense capitalized |  | $ 0 | $ 0 | $ 0
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant under stock option plans | shares |  | 8,078,751 |  |
Vesting period for stock option plans |  | 4 years |  |
Expiration period of stock option plan |  | 10 years |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 1,106,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares | 190,000 |  |  |

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