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Summary of Significant Accounting Policies - Summary of Customers that Accounted for at Least 10% of Company's Net Revenues (Details) (Customer Concentration Risk, Revenues)
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12 Months Ended | |||||||||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||
| Concentration Risk, Percentage | 30.40% | 32.50% | 41.50% | |||||||
| Fluor | ||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||
| Concentration Risk, Percentage | 17.40% | [1] | 14.80% | [1] | 0.00% | [1] | ||||
| U.S. Forest Service | ||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||
| Concentration Risk, Percentage | 13.00% | 14.70% | 28.60% | |||||||
| Italian Ministry of Civil Protection | ||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||
| Concentration Risk, Percentage | 0.00% | [2] | 3.00% | [2] | 12.90% | [2] | ||||
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