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Certain Balance Sheet Components Accounts Receivable, Net, Additional Information (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Accounts Receivable, Net (Line Items] | ||
| Contract Receivable Retainage, Due after Next Rolling Twelve Months | $ 0 | $ 0 |
| Number of months current retainage amounts and unbilled receivables are expected to be collected | 12 months | |
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Current retainage contract receivables [Member]
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| Accounts Receivable, Net (Line Items] | ||
| Contract Receivable Retainage, Due One Year or Less | 19,500,000 | 20,000,000 |
| Unbilled Contracts Receivable | 7,600,000 | 11,100,000 |
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Long Term Retainage Contract Receivables [Member]
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| Accounts Receivable, Net (Line Items] | ||
| Long-term unbilled retainage receivables | $ 2,500,000 | $ 0 |
| X | ||||||||||
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- Definition
The number of months within which current retainage amounts and unbilled receivables are expected to be collected, as of the balance sheet date. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected after the next rolling twelve months following the latest balance sheet presented. No definition available.
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| X | ||||||||||
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- Definition
Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected in the next fiscal year following the latest fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of unbilled receivables under long-term contracts that have not been billed and were not billable that are expected to be collected after the next fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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