Segments - Additional Information (Detail)	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	[1]	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	[1]
Segment Reporting Information [Line Items]
Number of reportable segments | segment				2
Intersegment sales	$ 647,094,000	$ 584,985,000		$ 1,268,919,000	$ 1,170,484,000
Intersegment Eliminations
Segment Reporting Information [Line Items]
Intersegment sales				$ 0

[1] Reflects reclassifications from previously disclosed amounts to conform to current presentation.