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Summary of Significant Accounting Policies - Stock-Based Compensation (Detail)	9 Months Ended
	Sep. 30, 2017 shares
Restricted Stock Units to be Settled in Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares (in shares).	1

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- Definition

Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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