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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
	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.

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability purchases and issuances.

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No definition available.

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability sales and settlements.

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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.

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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)
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Amount of gain (loss) recognized in other comprehensive income (loss) 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.

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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.

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