Revenue - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 206,692	$ 157,941	$ 377,899	$ 302,747
Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	189,201		344,401
Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	17,491		33,498
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	189,201		344,401	$ 302,700
Residential [Member] | Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	189,201		344,401
Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	17,491		33,498
Commercial [Member] | Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 17,491		$ 33,498