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 Billions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)
Derivative Instruments Gain Loss [Line Items]
Amount received from (paid for) on settlement of net investment hedges	$ 15,900,000	$ 120,100,000	$ 16,800,000	$ 121,500,000
Interest expense reclassified	76,455,000	68,902,000	157,267,000	137,663,000
Debt	11,139,415,000		11,139,415,000				$ 11,626,831,000
Amount of gain (loss) included in AOCI	(23,061,000)	74,937,000	(21,600,000)	(49,342,000)
Forward Contracts
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) included in AOCI	0	$ (5,400,000)	0	$ 10,000,000
Designated As Hedging Instrument [Member] | Forward Contracts
Derivative Instruments Gain Loss [Line Items]
Debt	3,500,000,000		3,500,000,000			€ 3.2	$ 3,500,000,000	€ 3.2
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Interest expense reclassified	$ 1,100,000		$ 2,100,000
Scenario Forecast | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Interest expense reclassified					$ 6,300,000