Financial Instruments and Fair Value Measurements - Schedule of Fair Value and Classification of Derivative Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Asset	$ 47,114	$ 53,579
Liability	1,268	13,729
Forwards and Options [Member] \| GBP [Member]
Derivatives Fair Value [Line Items]
Asset	16,985	4,241
Liability	0	745
Forwards and Options [Member] \| EUR
Derivatives Fair Value [Line Items]
Asset	10,933	11,711
Liability	0	84
Forwards and Options [Member] \| JPY [Member]
Derivatives Fair Value [Line Items]
Asset	9,246	832
Liability	1,071	717
Forwards and Options [Member] \| Other Currency [Member]
Derivatives Fair Value [Line Items]
Asset	831	3,324
Liability	197	88
Interest Rate Hedges [Member]
Derivatives Fair Value [Line Items]
Asset	435	0
Liability	0	12,095
Net Investment Hedges [Member] \| CAD
Derivatives Fair Value [Line Items]
Asset	1,245	0
Liability	0	0
Net Investment Hedges [Member] \| GBP [Member]
Derivatives Fair Value [Line Items]
Asset	7,439	33,471
Liability	$ 0	$ 0

Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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