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Employee Bargaining Agreements and Benefit Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Employees Pension_Plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of temporary employees | Employees | 100 |  |
Expenses for defined contribution plan | $ 5,000,000 | $ 13,000,000 | $ 13,000,000
Number of benefit plans, description | the Company sponsors two defined benefit plans in the United Kingdom under which accrual of pension benefits have ceased. Plan member benefits that have previously been accrued are indexed in line with inflation during the period up to retirement in order to protect their purchasing power. |  |
Cash contribution | $ 3,000,000 |  |
Net periodic benefit cost | $ 6,000,000 |  |
Defined benefit plan, concentration risk, description | the Company’s management believes that there are no significant concentrations of risk associated with plan assets. |  |
UK [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of defined benefit plan | Pension_Plan | 2 |  |
Other Expenses [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charge related to lump-sum transaction | $ 3,000,000 |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees | Employees | 2,500 |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of employees collective bargaining agreement | 1.00% |  |
Net periodic benefit cost |  | $ 1,000,000 | $ 1,000,000
Defined benefit plan, expected future benefit payments in next twelve months | $ 1,000,000 |  |
Defined benefit plan, expected future benefit payments in year two | 1,000,000 |  |
Defined benefit plan, expected future benefit payments in year three | 1,000,000 |  |
Defined benefit plan, expected future benefit payments in year four | 1,000,000 |  |
Defined benefit plan, expected future benefit payments in year five | 1,000,000 |  |
Defined benefit plan, expected future benefit payments in year five and thereafter | 1,000,000 |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 0 |  |

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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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