Acquisitions and Dispositions (Additional Information - Acquisitions) (Detail) $ in Thousands, € in Millions							3 Months Ended	9 Months Ended		12 Months Ended
	Jul. 01, 2015 USD ($)	Jun. 10, 2015 EUR (€)	Jun. 10, 2015 USD ($)	May. 29, 2015 EUR (€)	May. 29, 2015 USD ($)	Apr. 28, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill							$ 1,400,185	$ 1,400,185		$ 1,321,277
Contingent consideration for acquisition								4,705	$ 0
Novotema, SpA
Business Acquisition [Line Items]
Revenues										33,000
Aggregate purchase price, cash paid				€ 56.0	$ 61,100
Goodwill							33,934	33,934
Intangible assets							20,011	20,011
Goodwill not deductible for tax purposes					$ 33,900
Alfa Valvole, s.r.l
Business Acquisition [Line Items]
Revenues										33,000
Aggregate purchase price, cash paid		€ 99.8	$ 112,600
Goodwill							67,970	67,970
Intangible assets							32,058	32,058
Goodwill not deductible for tax purposes			$ 68,000
CIDRA Precision Services, LLC
Business Acquisition [Line Items]
Revenues										$ 9,000
Aggregate purchase price, cash paid	$ 19,500
Eran-out	4,700
Goodwill							9,826	9,826
Intangible assets							12,290	12,290
Consideration transferred	24,200
Goodwill deductible for tax purposes	9,800
CIDRA Precision Services, LLC | Minimum
Business Acquisition [Line Items]
Contingent consideration for acquisition	0
CIDRA Precision Services, LLC | Maximum
Business Acquisition [Line Items]
Contingent consideration for acquisition	$ 5,500
Aegis Flow Technologies
Business Acquisition [Line Items]
Aggregate purchase price, cash paid						$ 25,000
Goodwill						7,700
Intangible assets						8,800
Goodwill deductible for tax purposes						$ 7,700
Selling, General And Administrative Expenses
Business Acquisition [Line Items]
Acquisition-related transaction costs							900	2,100
Cost Of Goods Sold
Business Acquisition [Line Items]
Fair value of inventory charges associated with acquisitions							$ 2,700	$ 3,400