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Fair Value Measurements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Company Lenders | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Fair Value Disclosures [Abstract] |  |  |  |  |
Interest and dividends | $ 139 | $ 103 | $ 248 | $ 171 |
Mark-to-market gain (loss) | (576) | $ 2,100 | 832 | $ 2,600 |
Allowance for doubtful accounts on accounts receivable | 2,961 |  | $ 2,961 |  | $ 2,719
Number of financial institutions included in counter parties | Company |  |  | 17 |  |
Number of secured lenders not in banking credit facility | Lenders |  |  | 2 |  |
Net derivative assets | $ 19,900 |  | $ 19,900 |  |

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