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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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Opening Balance, Liabilities	$ 35,107	$ 42,152	$ 42,159	$ 45,984
Total realized and unrealized (gains) losses included in Net income (loss), Liabilities	(1,541)	(533)	(1,173)	(4,242)
Unrealized (gains) losses included in Other comprehensive income (loss), Liabilities		7	(67)	14
Purchases/ Issuances, Liabilities			2,959
Sales/ Settlements, Liabilities	(133)	(1,652)	(9,843)	(9,186)
Closing Balance, Liabilities	36,515	41,026	36,515	41,026
Unrealized (gains) losses for the period included in Net income (loss) on Level 3 Assets/Liabilities Outstanding	$ (1,541)		(1,173)
Unrealized (gains) losses for the period included in Other comprehensive income (loss) on Level 3 Assets/Liabilities Outstanding			$ (67)
Unrealized (gains) losses for the period on Level 3 Assets/Liabilities Outstanding		$ (533)		$ (4,242)

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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 net unrealized gain loss included in net income (loss).

+ References

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability net unrealized gain loss included in other comprehensive income (loss).

+ References

No definition available.

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- Definition

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

+ References

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 in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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