Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues		$ 957,756	$ 889,053	$ 1,672,479	$ 1,669,024
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	742,926	709,074	1,297,742	1,305,417
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		214,830	179,979	374,737	363,607
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenues		911,004	847,813	1,586,296	1,589,788
Goods and Services Transferred at a Point in Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	718,582	686,463	1,250,765	1,262,289
Goods and Services Transferred at a Point in Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		192,422	161,350	335,531	327,499
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenues		46,752	41,240	86,183	79,236
Goods and Services Transferred Over Time | U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues	[1]	24,344	22,611	46,977	43,128
Goods and Services Transferred Over Time | International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenues		$ 22,408	$ 18,629	$ 39,206	$ 36,108

[1] U.S. segment revenues include eliminations of intercompany transactions with the international operating segment.  See Note 16 for additional information on intercompany eliminations.