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Contracts Receivable - Additional Information (Detail) (USD $)
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6 Months Ended | ||
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Jun. 30, 2012
Customer
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Dec. 31, 2011
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Jan. 14, 2011
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Contract retainage | $ 11,000,000 | ||
| Contract retainage to be collected in twenty equal monthly installments | 12,500,000 | ||
| Contract retainage to be collected through January 2013 | 4,200,000 | ||
| Contract receivable | 81,157,000 | 72,474,000 | |
| Number of customers account for 65.6% of contract receivable | 3 | ||
| Unpaid contract receivable for which short term extension requested by customer | 21,700,000 | ||
| Unpaid contract receivable, past due | 4,000,000 | ||
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Top 3 Customer
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Contract receivable | 53,300,000 | ||
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Deepwater Projects
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Contract receivable | $ 31,600,000 |