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Employee Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 24, 2017 | Jun. 27, 2015 | Jan. 01, 2005
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option Outstanding | 193,000 | 199,000 |  |  |  |
Intrinsic value option exercised | $ 7.0 | $ 4.8 | $ 12.5 |  |  |
Stock compensation expense | 31.5 | 17.0 | 12.2 |  |  |
Recognized excess tax benefits for stock options exercised | 8.7 | 2.1 | 2.2 |  |  |
Total fair value of options vested | 0.1 | 0.1 | 0.3 |  |  |
Total unrecognized compensation cost | $ 33.0 |  |  |  |  |
Expected weighted average recognition period | 1 year 9 months 18 days |  |  |  |  |
2014 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for share based compensation award | 15,100,000 |  |  |  |  |
Shares available for issuance | 8,100,000 |  |  |  |  |
Number of additional shares available for future issuance | 800,000 |  |  |  |  |
Option Outstanding | 128,000 |  |  |  |  |
2014 Incentive Plan | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 3 years |  |  |  |  |
2014 Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 4 years |  |  |  |  |
2014 Incentive Plan | Cliff Vest | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 3 years |  |  |  |  |
2014 Incentive Plan | Cliff Vest | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 4 years |  |  |  |  |
2007 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance |  |  |  | 0 |  |
Option Outstanding | 28,000 |  |  |  |  |
2005 Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance |  |  |  |  | 0 |
Option Outstanding | 18,000 |  |  |  |  |
1998 Stock Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  | 0
Option Outstanding | 19,000 |  |  |  |  |
Stock Options and SARS | 2014 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Granted term | 10 years |  |  |  |  |
Options Or Stock Appreciation Rights | 2007 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Granted term | 10 years |  |  |  |  |
Options Or Stock Appreciation Rights | 2005 Equity Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Granted term | 10 years |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Total fair value of restricted stock/unit | $ 22.9 | $ 11.3 | $ 9.8 |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
RSUs Outstanding | 2,058,000 |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Tranche One |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 33.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Tranche Two |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 33.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Tranche Three |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 33.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Vesting On Second Anniversary |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 50.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Vesting On Second and Third Anniversary |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 25.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Vesting On Fourth Anniversary |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award vesting percentage | 50.00% |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Vesting Over Three Years |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 3 years |  |  |  |  |
Restricted Stock Units (RSUs) | 2014 Incentive Plan | Share Based Compensation Award Vesting Over Two Years |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 2 years |  |  |  |  |
Service Condition Based Restricted Stock Unit Grants |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
RSUs Outstanding | 1,283,000 | 1,401,000 |  |  |  |
Weighted average grant date fair value, granted | $ 47.36 | $ 19.54 | $ 14.29 |  |  |
Performance and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 2 years |  |  |  |  |
RSUs Outstanding | 92,000 |  |  |  |  |
Stock award granted vesting period based on performance condition | 5 years |  |  |  |  |
Performance and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of number of shares of common stock earned | 0.00% |  |  |  |  |
Performance and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of number of shares of common stock earned | 120.00% |  |  |  |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
RSUs Outstanding | 775,000 | 948,000 |  |  |  |
Weighted average grant date fair value, granted | $ 41.62 | $ 23.18 | $ 14.42 |  |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock award granted vested period | 3 years |  |  |  |  |
RSUs Outstanding | 683,000 |  |  |  |  |
Increased percentage of number of shares of additional common stock earned | 10.00% |  |  |  |  |
Decreased percentage of number of shares of additional common stock earned | 10.00% |  |  |  |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of number of shares of common stock earned | 0.00% |  |  |  |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of number of shares of common stock earned | 200.00% |  |  |  |  |

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