Financial Instruments and Fair Value Measurements - Summary of Gains (Losses) From Change in Fair Value of Derivative Instruments Included in Other Comprehensive Income (Parenthetical) (Detail) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2014 EUR (€)	Dec. 31, 2013 EUR (€)
Derivative Instruments Gain Loss [Line Items]
Amount received from (paid for) on settlement of net investment hedges		$ 128,200	$ 13,000	$ 7,800
Interest expense reclassified		301,363	308,885	379,327
Debt		11,626,831	9,336,977
Amount of gain (loss) included in AOCI		(208,901)	(171,401)	(234,680)
Foreign Currency Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) included in AOCI		10,000	7,500
Designated As Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Debt		$ 3,500,000	3,000,000	$ 1,000,000	€ 3,200.0	€ 2,500.0	€ 700.0
Non-Derivative Net Investment Hedges [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Debt			$ 118,500			€ 97.6
Scenario Forecast | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Interest expense reclassified	$ 5,600