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Equity - Non-controlling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Income attributable to non-controlling interests	$ 3,247	$ 1,715	$ 10,917
Carrying value of the investments held by Quanta in variable interest entities	7,800	3,300
Non-controlling interests	4,058	3,275
Distributions to non-controlling interests	2,001	$ 761
Net distributions to non-controlling interests			$ 18,915
Decrease in non-controlling interests from purchase of interests	$ 463

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- Definition

Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders, Net Of Contributions Received

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

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-Publisher FASB
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-Topic 942
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-Section S99
-Paragraph 1
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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

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