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Acquisition Payment Expense - Boost ETP, LLP (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Apr. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition payment	$ 6,738
Boost [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of issued and outstanding membership interest acquired		75.00%
Percentage of equity interest to be acquired		25.00%

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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+ References

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- Definition

Remaining equity interests to be acquired under the terms of the agreement.

+ References

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- Definition

The amount of expense recognized in business combination.

+ References

No definition available.

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