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Commitments and Contingencies (Investments in Affiliates and Other Entities) - Additional Information (Detail) $ in Millions | 27 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) km | May 31, 2022 USD ($) | Mar. 31, 2017 USD ($)
Other Commitments, Planned Oil and Gas Infrastructure Projects [Member] |  |  |
Other Commitments [Line Items] |  |  |
Outstanding capital commitment | $ 20.5 |  |
Scenario Forecast [Member] | Other Commitments, Planned Oil and Gas Infrastructure Projects [Member] |  |  |
Other Commitments [Line Items] |  |  |
Outstanding capital commitment |  | $ 20.2 | $ 0.3
Alberta Power Line [Member] |  |  |
Other Commitments [Line Items] |  |  |
Length of electrical transmission line to be constructed under contract | km | 500 |  |
Aggregate contributions to this unconsolidated affiliate | $ 13.5 |  |
Proceeds from return of capital | $ 2.9 |  |

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + 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 The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities. + References No definition available. + Details
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