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Investment in Laramie Energy - Change in Equity Investment (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |
Beginning balance |  | $ 108,823 |  |
Equity earnings (losses) from Laramie Energy, LLC |  | 18,369 | $ (22,381) | $ (55,983)
Ending balance |  | 127,192 | 108,823 |
Laramie Energy Company |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |
Beginning balance |  | 108,823 | 76,203 | 104,657
Equity earnings (losses) from Laramie Energy, LLC |  | 13,043 | (28,198) | (15,713)
Accretion of basis difference |  | 5,326 | 5,818 | 811
Impairment |  | 0 | 0 | (41,081)
Investments | $ 55,000 | 0 | 55,000 | 27,529
Ending balance |  | $ 127,192 | $ 108,823 | $ 76,203

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