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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity method investments |  |  |  | $ 0
Net brokered margin gain (loss) | $ (2,700,000) | $ 9,400,000 | $ (5,700,000) |
Allowance for doubtful accounts on accounts receivable | 4,994,000 | 2,719,000 |  |
Bad debt expense | 2,300,000 | 250,000 | $ 250,000 |
Inventory, other | 33,217,000 | 17,854,000 |  |
Materials and supplies inventory |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Inventory, other | 20,800,000 | 11,800,000 |  |
Commodity inventory |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Inventory, other | $ 4,800,000 | $ 2,000,000 |  |

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