Other Assets and Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Accrued expenses	$ 128,496	$ 132,728
Current income taxes and other taxes	109,438	101,351
Employee benefit-related liabilities	81,687	110,838
Deferred lease incentives	83,566	83,209
Unclaimed funds at LFB	26,022	31,592
Abandoned leased space (principally in the U.K.)	8,760	10,073
Deferred revenue	30,178	25,942
Securities sold, not yet purchased	3,239	9,290
Other	28,556	24,394
Total	$ 499,942	$ 529,417