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Revenue and Contract Costs (Tables) | 6 Months Ended
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Jun. 30, 2017
Contractors [Abstract] |
Pass-through Costs as a Percentage of Revenue | Our pass-through costs as a percentage of revenue for each period presented were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Pass-through costs as a percentage of revenues | 53.1% |  | 35.1% |  | 41.9% |  | 37.6%

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