CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Partners Capital [Abstract]
Net income	$ 274,113	$ 206,463
Other comprehensive income, net of tax and reclassification adjustments:
Net unrealized gains on investment securities	10,079	20,082
Reclassification to income for amortization of gains on terminated cash flow hedges		(70)
Foreign currency translation adjustment	(932)	402
Defined benefit plans liability adjustment	5,164	4,769
Total other comprehensive income	14,311	25,183
Total comprehensive income	$ 288,424	$ 231,646