Fair Value Remeasurement Based on Significant Inputs Not Observable (Detail) - USD ($) $ in Millions |
12 Months Ended | ||||||
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Dec. 31, 2017 |
Dec. 31, 2016 |
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||||||
Fair value, beginning balance | $ 3.0 | $ 8.8 | |||||
Fair value of acquisition liabilities paid | [1] | (1.5) | (7.6) | ||||
Fair value of consideration issued | 4.1 | ||||||
Change in fair value | [2] | (1.4) | (2.3) | ||||
Fair value, ending balance | $ 0.1 | $ 3.0 | |||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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