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Summary of Quarterly Results of Operations (Parenthetical) (Detail) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information [Line Items]
Loss on contract recognized	$ 20,600,000
Unfavorable reduction in gross margin due to contract loss from uncompleted contracts	26,800,000
Provision for loss on contract receivable		14,501,000
Asset impairments			7,690,000
Disputed Crane Rental Costs
Quarterly Financial Information [Line Items]
Asset impairments			5,900,000
Property Abandoned
Quarterly Financial Information [Line Items]
Asset impairments			$ 1,800,000

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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