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Long-lived Asset Impairment - Additional Information (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2015 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Termination fee |  |  | $ 4.0 | $ 4.0
Impairment of long lived assets held for use |  |  | 170.6 | 170.6
Property and equipment, salvage value |  | $ 5.7 | $ 5.7 | 5.7
WCS |  |  |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |  |  |
Termination fee |  | $ 4.0 |  |
Impairment of long lived assets held for use |  |  |  | 170.6
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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