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Employee Stock-based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 30, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted in period (in shares) |  | 0 | 0 | 0
Options exercised in period (in shares) |  | 836,000 |  |
2012 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized to be issued (in shares) |  | 31,400,000 |  |
New Employee Stock Inducement Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized to be issued (in shares) |  | 2,200,000 |  |
Employee Stock Purchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock purchase program purchase period |  | 6 months |  |
Employee stock purchase program discount from average market price (as a percentage) | 15.00% | 15.00% |  |
Percentage of authorized payroll deductions for common stock purchases by employees (as a percentage) |  | 10.00% |  |
Shares authorized to be issued under the Employee Stock Purchase Program (in shares) |  | 7,000,000 |  |
Remaining shares authorized to be issued under the Employee Stock Purchase Program (in shares) |  | 1,100,000 |  |
Service-Based Awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) |  | 3 years |  |
Performance Based Awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) |  | 1 year |  |
Performance Based Awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) |  | 3 years |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost related to unvested stock grants |  | $ 144 |  |
Cost expected to be recognized over a weighted-average period (in years) |  | 1 year |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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