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Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Joint Venture (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 15, 2016	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Percentage of operating results	90.00%	90.00%	90.00%

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- References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685

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