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Acquisitions - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Jun. 01, 2016	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 334,000,000	$ 334,000,000	$ 205,000,000
Power Service [Member]
Business Acquisition [Line Items]
Purchase price consideration	$ 176,000,000
Purchase price consideration in cash	182,000,000
Business combination consideration working capital adjustment	6,000,000
Goodwill	130,000,000
Intangible assets	46,000,000
Power Service [Member] | Non-Compete [Member]
Business Acquisition [Line Items]
Intangible assets	$ 7,000,000
Intangible assets amortization period	2 years
Power Service [Member] | Maximum [Member] | Former Owner [Member]
Business Acquisition [Line Items]
Rent expense attributable to related party		$ 1,000,000	1,000,000
Power Service [Member] | Maximum [Member] | Non-Compete [Member]
Business Acquisition [Line Items]
Amortization expense			$ 1,000,000
U.S. Energy [Member]
Business Acquisition [Line Items]
Goodwill	$ 0
U.S. Process Solutions [Member]
Business Acquisition [Line Items]
Goodwill	$ 130,000,000

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The assets recognized for each amount of assets recorded in a transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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