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Contract Balances - Additional Information (Detail1) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01 |
Contract With Customer Asset And Liability [Line Items] |
Revenue, Remaining performance obligation | $ 175.4
Revenue, Remaining performance obligations, Expected timing of satisfaction, Period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-07-01 |
Contract With Customer Asset And Liability [Line Items] |
Revenue, Remaining performance obligation | $ 5.8
Revenue, Remaining performance obligations, Thereafter | thereafter
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil) |
Contract With Customer Asset And Liability [Line Items] |
Revenue, Remaining performance obligation | $ 181.2
Revenue, Remaining performance obligations, Expected timing of satisfaction, Period |

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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