Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 03, 2014	Sep. 24, 2013	Jul. 30, 2013	Jan. 31, 2013	Aug. 19, 2014	Jun. 06, 2014
Business Acquisition [Line Items]
Goodwill	$ 862,338	$ 786,433
Other intangible assets	171,400
Net assets acquired	396,300
C2CE
Business Acquisition [Line Items]
Current assets			9,812
Property, plant & equipment			1,890
Goodwill			15,114
Other intangible assets			3,654
Total assets acquired			30,470
Total liabilities assumed			(5,359)
Net assets acquired			25,111
Longwood
Business Acquisition [Line Items]
Current assets				17,444
Property, plant & equipment				19,363
Goodwill				28,272
Other intangible assets				39,440
Other assets				7
Total assets acquired				104,526
Total liabilities assumed				(20,663)
Net assets acquired				83,863
Turbonetics
Business Acquisition [Line Items]
Current assets					5,532
Property, plant & equipment					992
Goodwill					11,309
Other intangible assets					11,140
Total assets acquired					28,973
Total liabilities assumed					(5,790)
Net assets acquired					23,183
Napier
Business Acquisition [Line Items]
Current assets						13,441
Property, plant & equipment						8,837
Goodwill						67,045
Other intangible assets						40,583
Total assets acquired						129,906
Total liabilities assumed						(17,565)
Net assets acquired						112,341
Dia-Frag
Business Acquisition [Line Items]
Current assets							12,477
Property, plant & equipment							4,497
Goodwill							42,955
Other intangible assets							26,150
Other assets							66
Total assets acquired							86,145
Total liabilities assumed							(15,504)
Net assets acquired							70,641
Fandstan
Business Acquisition [Line Items]
Current assets								124,848
Property, plant & equipment								61,379
Goodwill								60,078
Other intangible assets								50,598
Other assets								216
Total assets acquired								297,119
Total liabilities assumed								(97,715)
Net assets acquired								$ 199,404