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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Commitments And Contingencies Disclosure [Line Items] |  |
Capital lease assets | $ 60.9 | $ 63.4
Assets fully depreciated | 32.3 | 26.8
Capital leased assets, net book value | 9.7 | 13.0
Purchase obligation, 2019 | 25.8 |
Purchase obligation, 2020 | 20.8 |
Purchase obligation, 2021 | 14.6 |
Other Non-Current Assets [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Insurance receivable and indemnification asset | $ 2.5 | $ 2.8
Minimum [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Estimated life of capital lease | 4 years |
Noncancellable operating leases, renewal period | 1 year |
Maximum [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Estimated life of capital lease | 6 years |
Noncancellable operating leases, renewal period | 5 years |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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