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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Net brokered margin gain (loss) | $ (2,800) | $ (2,700) | $ 9,400
Allowance for doubtful accounts on accounts receivable | 5,559 | 4,994 |
Bad debt expense | 800 | 2,300 | $ 250
Inventory, other | $ 26,573 | 33,217 |
Number of reporting unit | Segment | 1 |  |
Materials and supplies inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory, other | $ 9,400 | 20,800 |
Commodity inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory, other | $ 8,300 | $ 4,800 |

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