Acquisitions - Additional Information (Detail) (USD $)		6 Months Ended				6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Customer Relationships	Jun. 30, 2013 Patents	Jun. 30, 2013 Noncompete Agreements	Jun. 30, 2013 Order or Production Backlog	Jun. 30, 2013 Favorable Leasehold Interest	Jun. 30, 2013 Trade Names	Jun. 30, 2013 Lh Group	Oct. 01, 2012 Lh Group	Jun. 30, 2013 Tec Tran	Jul. 13, 2012 Tec Tran	Jun. 30, 2013 Mors Smitt	Jun. 14, 2012 Mors Smitt	Jun. 30, 2013 Transdyne	Feb. 26, 2013 Transdyne	Jun. 30, 2013 Napier	Jan. 31, 2013 Napier	Jun. 30, 2013 Winco	Jul. 31, 2012 Winco
Indefinite Lived Intangible Assets By Major Class [Line Items]
Date of acquisition								Oct. 01, 2012		Jul. 13, 2012		Jun. 14, 2012		Feb. 26, 2013		Jan. 31, 2013		Jul. 31, 2012
Business acquisition, net purchase price, net of cash									$ 48,100,000		$ 8,300,000		$ 90,000,000		$ 2,400,000		$ 112,300,000		$ 3,700,000
Addition to goodwill	130,900,000								20,400,000		1,700,000		42,900,000		1,500,000		59,600,000		4,800,000
Goodwill tax deduction																			0
Escrow deposits	12,200,000
Total Goodwill and other intangible assets	232,000,000								39,033,000		6,717,000		79,730,000		1,483,000		97,652,000		7,401,000
Acquired intangible assets	$ 101,100,000	$ 68,800,000	$ 2,600,000	$ 600,000	$ 3,200,000	$ 800,000	$ 25,100,000
Average useful life, years		20 years	8 years	2 years		5 years