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Investment in Laramie Energy Change in Equity Investment (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |
Beginning balance | $ 108,823 |
Equity earnings from Laramie | 8,746 | $ (1,871)
Ending balance | 117,569 |
Laramie Energy Company |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |
Beginning balance | 108,823 |
Equity earnings from Laramie | 7,415 |
Accretion of basis difference | 1,331 |
Ending balance | $ 117,569 |

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