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Equity - Non-controlling Interests (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Equity [Abstract] |  |  |  |  |
Net income attributable to non-controlling interests | $ 348 | $ 536 | $ 1,686 | $ 1,232 |
Carrying value of the investments held by Quanta in variable interest entities | 9,700 |  | 9,700 |  | $ 7,800
Non-controlling interests | 1,416 |  | 1,416 |  | $ 4,058
Distributions to non-controlling interests | 1,300 | $ 400 | 2,900 | $ 1,800 |
Decrease in notes receivable | $ 500 |  | $ 1,400 |  |

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