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Basis of Presentation - Inventory - Additional Information (Detail) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Inventory and other | $ 30,064,000 | $ 21,346,000
Materials and supplies inventory |  |
Inventory [Line Items] |  |
Inventory and other | 9,900,000 | 12,100,000
Commodity inventory |  |
Inventory [Line Items] |  |
Inventory and other | $ 5,800,000 | $ 508,000

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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