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Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings - Schedule of Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 265,552	$ 182,709
Estimated earnings	53,744	37,438
Sum of costs incurred and estimated earnings on uncompleted contracts	319,296	220,147
Less billings to date	(276,284)	(173,047)
Amounts are presented in the Consolidated Balance Sheets as follows:
Costs and estimated earnings in excess of billings on uncompleted contracts	45,847	50,468
Billings in excess of costs and estimated earnings on uncompleted contracts	(2,835)us-gaap_BillingsInExcessOfCostCurrent	(3,368)us-gaap_BillingsInExcessOfCostCurrent
Total, net	$ 43,012	$ 47,100

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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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