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Rental expense and commitments - Additional Information (Detail) $ in Millions | Dec. 31, 2018 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Future minimum sublease rentals | $ 2.7
Standby letters of credit and surety bonds outstanding | 272.0
Deposits and collateralized assets | $ 15.0

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- Definition Deposits And Collateralized Assets Amount + References No definition available. + Details
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- Definition Letters Of Credit Outstanding And Surety Bonds Amount + References No definition available. + Details
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- References No definition available. + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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