Fair Value of Cross Currency Basis Swaps that are Designated as Hedges of Net Investments in Foreign Operations (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Net Asset (Liability)	$ (111,926)
Swiss franc 592.5 million @ $1.17 pay CHF 3mo. LIBOR rec. USD 3mo. LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Net Asset (Liability)	(99,917)
Euros 358.0 Million 1.22 Pay EUR 3 Month EURIBOR Rec USD 3 Month LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Net Asset (Liability)	(12,009)
Cross Currency Basis Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Net Asset (Liability)	(67,690)
Cross Currency Basis Swaps | Euros 358.0 Million 1.22 Pay EUR 3 Month EURIBOR Rec USD 3 Month LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Net Asset (Liability)	(67,690)
One Year from Balance Sheet Date
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	60,254
One Year from Balance Sheet Date | Swiss franc 592.5 million @ $1.17 pay CHF 3mo. LIBOR rec. USD 3mo. LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	60,254
More than One and within Two Years from Balance Sheet Date
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,284,015
More than One and within Two Years from Balance Sheet Date | Swiss franc 592.5 million @ $1.17 pay CHF 3mo. LIBOR rec. USD 3mo. LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	484,910
More than One and within Two Years from Balance Sheet Date | Euros 358.0 Million 1.22 Pay EUR 3 Month EURIBOR Rec USD 3 Month LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	799,105
More than Two and within Three Years from Balance Sheet Date [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	85,591
More than Two and within Three Years from Balance Sheet Date [Member] | Swiss franc 592.5 million @ $1.17 pay CHF 3mo. LIBOR rec. USD 3mo. LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	85,591
More than Two and within Three Years from Balance Sheet Date [Member] | Euros 358.0 Million 1.22 Pay EUR 3 Month EURIBOR Rec USD 3 Month LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	0
More than Two and within Three Years from Balance Sheet Date [Member] | Cross Currency Basis Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	581,568
More than Two and within Three Years from Balance Sheet Date [Member] | Cross Currency Basis Swaps | Euros 358.0 Million 1.22 Pay EUR 3 Month EURIBOR Rec USD 3 Month LIBOR
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 581,568