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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation Allowance |  | $ 202,000,000 | $ 129,000,000 |
Deferred tax liability |  | 6,000,000 | 7,000,000 |
Unrecognized tax benefits |  | 1,000,000 | 1,000,000 |
Unrecognized tax benefits, income tax penalties and interest expense |  | 0 |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  | 0 |  |
Valuation allowance |  | 5,000,000 |  |
Foreign tax credit carryforwards |  | 5,000,000 | 3,000,000 |
Undistributed earnings |  | 140,000,000 |  |
Provision for U.S. federal income tax |  | 2,000,000 | (14,000,000) | $ 38,000,000
Provision for state income tax |  |  | (1,000,000) | $ 4,000,000
Foreign Subsidiaries [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Provision for U.S. federal income tax |  | 0 |  |
Provision for state income tax |  | 0 |  |
Domestic Country [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation Allowance |  | 68,000,000 |  |
Operating loss carryforwards |  | 194,000,000 | $ 30,000,000 |
Deferred tax benefit |  | $ 68,000,000 |  |
Operating loss carryforwards expiration year |  | 2036 | 2035 |
State [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 105,000,000 | $ 35,000,000 |
Valuation allowance |  | 4,000,000 |  |
Foreign Country [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Operating loss carryforwards |  | 26,000,000 | 7,000,000 |
Valuation allowance |  | $ 7,000,000 |  |
Operating Loss Carryforwards without expiration date |  |  | 9,000,000 |
Operating Loss Carryforwards with expiration date |  |  | $ 17,000,000 |
Foreign Country [Member] | Maximum [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Operating loss carryforwards expiration year |  | 2026 |  |
Power Service [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Deferred tax liability of intangible assets | $ 19,000,000 |  |  |
Deferred tax liabilities of reduction of valuation allowance | (18,000,000) |  |  |
Deferred tax liability | 1,000,000 |  |  |
Deferred tax assets, valuation allowance | $ (1,000,000) |  |  |
United States [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation Allowance |  | $ 64,000,000 |  |
Canada (Member) |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation Allowance |  | 7,000,000 |  |
Other Foreign Jurisdictions [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation Allowance |  | $ 2,000,000 |  |

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