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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Jun. 30, 2012 | Jan. 31, 2013 Q3 Contracting | Jun. 30, 2013 Q3 Contracting | Dec. 31, 2012 Q3 Contracting
Stockholders' equity |  |  |  |  |  |
Amount received for shares of common stock issued under a purchase arrangement | $ 1,455 | $ 1,240 |  |  |  |
Shares of common stock issued to managers and executives under a purchase arrangement within the Long-Term Incentive Plan for bonuses earned in the prior year | 131,989 | 111,790 |  |  |  |
Discounted price from market price at which shares purchased by participants in LTI Plan (as a percent) | 75.00% |  |  |  |  |
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors | 12,480 |  |  |  |  |
Common stock issued for acquisition |  |  | $ 980 |  |  | $ 430
Price of shares issued (in dollars per share) |  |  |  |  |  | $ 14.69
Stock issued to sellers (in shares) |  |  |  | 29,273 | 29,273 |

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