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Summary of Significant Accounting Policies - Stock-Based Compensation (Detail)	12 Months Ended
	Dec. 31, 2017 shares
Restricted Stock Units to be Settled in Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that may be received by RSU holder (in shares)	1

X

- 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.

+ Details

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X

- 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.

+ Details

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X

- Details

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