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Commitments And Contingencies - Additional Information (Detail) (USD $)	1 Months Ended		9 Months Ended
	Dec. 31, 2010	Mar. 31, 2010	Sep. 30, 2012	Dec. 31, 2011	Oct. 30, 2010	Apr. 20, 2010
Commitments And Contingencies [Line Items]
General liability coverage					$ 200,000,000	$ 100,000,000
Amount of interest, penalties and monetary restatement fees on tax assessment			7,800,000
Tax assessments settled with payments	3,900,000	12,200,000
Value of Brazilian subsidiary served with assessments			13,000,000
Customer prepayments			75,026,000	76,610,000
ATP [Member]
Commitments And Contingencies [Line Items]
Receivables from bankruptcy			1,400,000
Customer prepayments			$ 4,300,000

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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