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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net brokered margin gain (losses) |  |  |  |  | $ (16,300,000) | $ (5,700,000) | $ (2,800,000)
Allowance for doubtful accounts on accounts receivable | $ 6,118,000 |  |  |  | 6,118,000 | 7,111,000 |
Bad debt (income) expense |  |  |  |  | (1,000,000) | 1,550,000 | 800,000
Inventory and other | 22,964,000 |  |  |  | 22,964,000 | 21,346,000 |
Goodwill from MRD merger |  |  |  |  |  |  | 1,700,000,000
Purchase adjustment, decrease in goodwill |  |  |  |  |  | 13,100,000 |
Goodwill impairment charge | 1,641,197,000 | $ 0 | $ 0 | $ 0 | 1,641,197,000 | 0 | $ 0
Materials and supplies inventory |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventory and other | 8,000,000 |  |  |  | 8,000,000 | 12,100,000 |
Commodity inventory |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventory and other | $ 965,000 |  |  |  | $ 965,000 | $ 508,000 |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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