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Summary of Quarterly Results of Operations (Parenthetical) (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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| 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 | ||
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Disputed Crane Rental Costs
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| Quarterly Financial Information [Line Items] | |||
| Asset impairments | 5,900,000 | ||
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Property Abandoned
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| Quarterly Financial Information [Line Items] | |||
| Asset impairments | $ 1,800,000 | ||
| X | ||||||||||
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- Definition
Decrease in Gross Margin No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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