Financial Instruments and Fair Value Measurements - Additional Information (Detail)	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 Foreign Currency Forward Contracts [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts [Member] USD ($)	Sep. 30, 2014 Foreign Currency Forward Contracts [Member] EUR (€)	Feb. 28, 2014 Foreign Currency Forward Contracts [Member] USD ($)	Feb. 28, 2014 Foreign Currency Forward Contracts [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts [Member] EUR (€)
Derivative [Line Items]
Debt issued	$ 8,813,000,000		$ 8,813,000,000		$ 2,400,000,000	$ 1,000,000,000	€ 1,900,000,000	$ 1,600,000,000	€ 1,200,000,000	€ 700,000,000
Amount of gain (loss) included in AOCI	(130,763,000)	88,001,000	(72,022,000)	(250,251,000)	214,600,000	(14,900,000)
Hedge ineffectiveness	$ 0	$ 0	$ 0	$ 0