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Commitments and Contingencies - Concentrations of Credit Risk (Details) - Customer Concentration Risk - Customer	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Number of customers representing 10% or more of Quanta's consolidated net receivable position	0	0
Number of customers representing 10% or more of Quanta's consolidated revenues	0	0	0

X

- Definition

Number Of Customers Representing Ten Percent Or More Of Net Receivable Position

+ References

No definition available.

+ Details

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X

- Definition

Number of customers representing 10% or more of revenues

+ 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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