Schedule of Changes in Carrying Amount of Goodwill Attributable to Each Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Beginning Balance	$ 676,582	$ 571,796
Adjustments	(634)
Acquisitions		112,221
Disposals	(195)
Foreign currency translation	(6,310)	(7,435)
Ending Balance	669,443	676,582
Industrial Products Group
Goodwill [Line Items]
Beginning Balance	358,235	250,084
Adjustments	(634)
Acquisitions		112,221
Disposals	(195)
Foreign currency translation	(3,959)	(4,070)
Ending Balance	353,447	358,235
Engineered Products Group
Goodwill [Line Items]
Beginning Balance	318,347	321,712
Foreign currency translation	(2,351)	(3,365)
Ending Balance	$ 315,996	$ 318,347

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

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-Number 141R

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details