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Goodwill and Other Intangible Assets - Intangible Assets Other Than Goodwill (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount $ 403,229 $ 131,400
Accumulated amortization (78,934) (58,781)
Net 324,295 72,619
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross carrying amount 475,229 150,900
Accumulated amortization (78,934) (58,781)
Net 396,295 92,119
Trade name [Member]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Gross carrying amount 72,000 19,500
Net 72,000 19,500
Customer relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount 101,681 101,600
Accumulated amortization (49,664) (37,052)
Net 52,017 64,548
Advisor relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount 240,300  
Net 240,300  
Sponsor Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount 16,500  
Net 16,500  
Curriculum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount 800  
Net 800  
Technology [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross carrying amount 43,948 29,800
Accumulated amortization (29,270) (21,729)
Net $ 14,678 $ 8,071