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Commitments and Contingencies - Capital Leases and Operating Leases Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |  |  |
Capital leases term of contract | 2 years |  |
Remaining term on operating lease | 5 years |  |
Rent expense | $ 41.2 | $ 39.6 | $ 17.7

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- Definition Term of the capital leases arrangement. + References No definition available. + Details
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- Definition Lessee Leasing Arrangements, Operating Leases, Remaining Term Of Contract + References No definition available. + Details
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- References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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