Financial Instruments and Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Contracts	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Number of option contract	1
Maximum length of time hedged in cash flow hedges	10 years
Gain (Loss) on Early Extinguishment of Debt, Net			$ (11,000,000)
Amount of gain (loss) included in OCI	(171,401,000)	(234,680,000)	(79,014,000)
Foreign Currency Derivatives [Member]
Derivative [Line Items]
Amount of gain (loss) included in OCI	(614,800,000)	(237,600,000)	(61,600,000)
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional value of ineffective interest rate swaps			$ 703,800,000