Other Assets and Other Liabilities - Schedule of Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Liabilities [Line Items]
Accrued expenses	$ 147,194	$ 150,282
Current and deferred income taxes and other taxes	121,854	112,691
Employee benefit-related liabilities	83,629	70,036
Deferred lease incentives	74,880	31,750
Unclaimed funds at LFB	28,716	27,281
Abandoned leased space (principally in the U.K.)	8,475	11,688
Securities sold, not yet purchased	2,755	4,282
Other	32,148	32,121
Total	$ 499,651	$ 440,131