Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 14, 2017	Dec. 31, 2016	Dec. 14, 2016	Nov. 17, 2016	Aug. 01, 2016	May 05, 2016
Business Acquisition [Line Items]
Goodwill	$ 2,188,503		$ 2,078,765
ATP
Business Acquisition [Line Items]
Current assets		$ 10,882
Property, plant & equipment		2,787
Goodwill		35,146
Other intangible assets		34,800
Other assets		0
Total assets acquired		83,615
Total liabilities assumed		(18,403)
Net assets acquired		$ 65,212
Workhorse
Business Acquisition [Line Items]
Current assets				$ 9,137
Property, plant & equipment				0
Goodwill				24,838
Other intangible assets				19,400
Other assets				0
Total assets acquired				53,375
Total liabilities assumed				(9,083)
Net assets acquired				$ 44,292
Precision Turbo
Business Acquisition [Line Items]
Current assets					$ 4,183
Property, plant & equipment					1,346
Goodwill					3,942
Other intangible assets					5,200
Other assets					0
Total assets acquired					14,671
Total liabilities assumed					(825)
Net assets acquired					$ 13,846
Gerken
Business Acquisition [Line Items]
Current assets						$ 32,706
Property, plant & equipment						7,667
Goodwill						17,470
Other intangible assets						30,560
Other assets						1,706
Total assets acquired						90,109
Total liabilities assumed						(27,262)
Net assets acquired						$ 62,847
Unitrac
Business Acquisition [Line Items]
Current assets							$ 12,136
Property, plant & equipment							1,768
Goodwill							1,388
Other intangible assets							1,230
Other assets							0
Total assets acquired							16,522
Total liabilities assumed							(2,144)
Net assets acquired							$ 14,378