Revenue From Contracts With Customers - Summary of Disaggregated Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 179,571	$ 171,207
Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	165,479	155,200
Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	14,092	16,007
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	165,479	155,200
Residential [Member] | Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	165,479	155,200
Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	14,092	16,007
Commercial [Member] | Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 14,092	$ 16,007