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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended			3 Months Ended
	May 24, 2012	Jun. 30, 2013 Derivative	Jan. 31, 2012	Apr. 30, 2013 Australian Electricity Systems PTY Ltd [Member]	Mar. 31, 2013 Forma Line Industries CC [Member]
Business Acquisition, Contingent Consideration [Line Items]
Increase in credit facility	$ 90,000,000
Carrying interest rate	LIBOR plus 1.125%
Interest rate	1.125%
Expiration date of credit facility	Jan. 01, 2015
Fair value liabilities Level 2		0
Immaterial derivative outstanding		0
Additional earn-out consideration payment			1,200,000
Accrued liability additional earn out consideration payment				$ 400,000	$ 100,000
Period of earn-out contingent consideration					1 year

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Additional earn out contingent consideration payment maximum.

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Earn-out contingent consideration arrangement period.

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Fair value liabilities level two transfers in and out amount.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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Date the credit facility terminates, in CCYY-MM-DD format.

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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