Fair Value Measurements - Summary of Changes in Fair Value Contingent Consideration (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Business Combination, Contingent Consideration, Liability [Roll Forward]
Fair value of contingent consideration	$ 35,702	$ 56,463
Escrow adjustment	(200)	(4,711)
Changes in valuation	(21,486)	6,472
Payments and settlements	(3,193)	(30,924)
Foreign currency adjustment	(322)	2,753
Fair value of contingent consideration	10,501	35,702
Generation Digital
Business Combination, Contingent Consideration, Liability [Roll Forward]
Fair value adjustment		3,600
Payments and settlements	$ (1,100)
Escada
Business Combination, Contingent Consideration, Liability [Roll Forward]
Fair value adjustment		$ 2,049

Business Combination, Contingent Consideration, Liability [Roll Forward]

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- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Escrow Adjustment

+ References

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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- Definition

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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- Definition

Amount of purchases 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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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.

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-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=99377789&loc=d3e19207-110258

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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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