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Equity and Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest, Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Jul. 07, 2016 | Jan. 31, 2013
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Investment [Line Items] |  |  |
Contractually defined redemption value | $ 15.0 |  |
Vital River |  |  |
Investment [Line Items] |  |  |
Ownership percentage | 87.00% | 12.00% | 75.00%
Noncontrolling interest ownership percentage | 13.00% |  |

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- Definition Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 24(b) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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