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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | May 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |
Noncurrent liability | $ 1,061.7 |  | $ 1,041.5
Snake River |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Cash consideration receivable upon sale of interest in subsidiary |  | $ 12.5 |
Divestiture of interest in subsidiary deemed payment of loans in full as part of consideration |  | $ 250.0 |
Noncurrent liability | $ 250.0 |  |

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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Divestiture of interest in subsidiary deemed payment of loans in full as part of consideration. + References No definition available. + Details
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- Details
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