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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Revenues and Services Concentration) (Detail) - Geographic concentration [Member]
Sep. 30, 2015
Dec. 31, 2014
Revenues and services concentration    
Concentration risk, additional characteristic investment advisory clients outside the U.S. investment advisory clients outside the U.S.
Concentration risk, percentage 4.90% 5.60%
Concentration risk, benchmark description assets under management at September 30, 2015 assets under management at December 31, 2014