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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Commitments And Contingencies Disclosure [Line Items] |  |
Capital lease assets | $ 62.8 | $ 63.4
Assets fully depreciated | 24.8 | 26.8
Capital leased assets, net book value | 11.7 | 13.0
Other Non-Current Assets [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Insurance receivable and indemnification asset | $ 2.8 | $ 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://www.xbrl.org/2003/role/presentationRef -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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