Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Stock-Based Compensation (Detail)

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Summary of Significant Accounting Policies - Stock-Based Compensation (Detail)
6 Months Ended
Jun. 30, 2018
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