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Employee Bargaining Agreements and Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Employees Pension_Plan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of temporary employees | Employees | 200 |  |
Expenses for defined contribution plan | $ 13 | $ 12 | $ 13
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. The second defined benefit plan was acquired from the John MacLean & Sons Electrical acquisition in March 2015. |  |
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 |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees | Employees | 4,500 |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of employees collective bargaining agreement | 1.00% |  |
Net periodic benefit cost | $ 1 | $ 1 | $ 1
Defined benefit plan, expected future benefit payments in next twelve months | 1 |  |
Defined benefit plan, expected future benefit payments in year two | 1 |  |
Defined benefit plan, expected future benefit payments in year three | 1 |  |
Defined benefit plan, expected future benefit payments in year four | 1 |  |
Defined benefit plan, expected future benefit payments in year five | 1 |  |
Defined benefit plan, expected future benefit payments in year five and thereafter | 2 |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 1 |  |

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- Definition Description of nature and type of retirement benefits. Includes, but is not limited to, plan utilized, employee group covered, type of plan formula and funding policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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