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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock, shares issued | 55,500,000 | 55,200,000 |
Weighted Average Grant Date Fair Value, Granted | $ 33.55 | $ 23.88 | $ 16.04
Restricted Stock Units (RSUs) [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total fair value of RSUs vested | $ 56.6 | $ 86.2 | $ 68.1
Total compensation expense related to restricted stock unites | $ 35.6 |  |
Estimated weighted average amortization period | 1 year |  |
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting percentage per year of RSUs from date of grant | 33.00% |  |
RSUs Granted to Employees [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award vesting period description | employees who meet certain retirement eligibility requirements will vest in full upon each such employee’s retirement and are expensed immediately. |  |
RSUs Granted To Directors [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award vesting period description | directors generally vest at the earliest of (1) one day prior to the next annual meeting, (2) 13 months from date of grant, or (3) the effective date of a change in control of the Company. |  |
2014 ESPP [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 2,500,000 |  |
Percentage of payroll deduction to compensation | up to 10% |  |
Percentage of Common Stock through payroll deductions | 10.00% |  |
Percentage of closing price of the Common Stock | 90.00% |  |
Common stock, shares issued | 100,000 | 100,000 | 100,000
Common stock reserved for issuance | 1,600,000 |  |
2014 ESPP [Member] | Offer Terminate [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of closing price of the Common Stock | 90.00% |  |
Stock Incentive Plan 2014 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock reserved for issuance | 12,200,000 |  |
Shares available for future grant | 18,000,000 |  |
Number of shares returned for each common stock | 2.4 |  |
Percentage of exercise price fair value option grant in period | 100.00% |  |
Stock Incentive Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 177.71 | $ 98.72 |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Level of performance target achieved | 0.00% | 0.00% | 0.00%
Minimum [Member] | 2014 ESPP [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock, exercise price | $ 126.00 | $ 95.07 | $ 64.31
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Level of performance target achieved | 200.00% | 150.00% | 150.00%
Maximum [Member] | 2014 ESPP [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock, exercise price | $ 136.94 | $ 93.77 | $ 63.78

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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