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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |
Net brokered margin gain (losses) | $ (5,700,000) | $ (2,800,000) | $ (2,700,000)
Allowance for doubtful accounts on accounts receivable | 7,111,000 | 5,559,000 |
Bad debt expense | 1,550,000 | 800,000 | $ 2,300,000
Inventory and other | 21,346,000 | 26,573,000 |
Goodwill | 1,641,197,000 | 1,654,292,000 |
Materials and supplies inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory and other | 12,100,000 | 9,400,000 |
Commodity inventory |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Inventory and other | $ 508,000 | $ 8,300,000 |

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- Definition Revenue less expenses related to brokering natural gas. The entity realizes a brokered margin as a result of buying and selling natural gas in back to back transactions. + References No definition available. + Details
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