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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) - Level 3 [Member] - Accounts Payable Accrued and Other Liabilities [Member] - Contingent Consideration [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Opening Balance, Liabilities | $ 45,984 | $ 41,386
Total realized and unrealized gains (losses) included in Net income (loss), Liabilities | (1,482) | (841)
Unrealized gains (losses) included in Other comprehensive income (loss), Liabilities | (576) | (863)
Purchases/ Issuances, Liabilities |  | 22
Sales/ Settlements, Liabilities | (5,903) | (8,764)
Closing Balance, Liabilities | 42,139 | 34,348
Unrealized gains (losses) for Level 3 Liabilities Outstanding | $ (2,058) | $ (1,704)

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability net, unrealized gain (loss). + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability purchases and issuances. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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