Impact of the Company's Hedges of Net Investments (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income	$ 2,379,000	$ (4,698,000)
Gain (Loss) in AOCI	(34,216,000)	30,971,000
Net Investment Hedging | Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income		(108,000)
Net Investment Hedging | Group 1 | Interest Income
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income	4,264,000	1,085,000
Net Investment Hedging | Group 1 | Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income	(1,885,000)
Net Investment Hedging | Cross Currency Interest Rate Swaps | Group 1
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) in AOCI	(34,216,000)	3,308,000
Net Investment Hedging | Cross Currency Interest Rate Swaps | Group 2
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) in AOCI		30,125,000
Net Investment Hedging | Cross Currency Interest Rate Swaps | Group 2 | Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income		(5,675,000)
Net Investment Hedging | Foreign Exchange Contract | Group 2
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) in AOCI		(2,462,000)
Net Investment Hedging | Foreign Exchange Contract | Group 2 | Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (Loss) Recognized in Income		$ 0