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Long-lived Asset Impairment - Additional Information (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2015 | Jun. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2017
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Contract termination fee received |  | $ 4.0 |  | $ 4.0
Impairment of long lived assets held for use |  |  |  | $ 170.6
WCS |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Impairment of long lived assets held for use |  |  | $ 170.6 |
Property and equipment, salvage value |  | $ 5.7 | 5.7 |
WCS | Net Property and Equipment |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Impairment of long lived assets held for use |  |  | 127.5 |
WCS | Disposal Site Operating Permits, Net |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Impairment of long lived assets held for use |  |  | 42.0 |
WCS | Other Asset |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Impairment of long lived assets held for use |  |  | $ 1.1 |
WCS | Divestiture Terms Previously Pending |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Proceeds from sale of subsidiary | $ 270.0 |  |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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- Definition The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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