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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Goodwill And Intangible Assets [Line Items]        
Additional goodwill recognized     $ 34,892,000  
Intangible amortization expense $ 8,800,000 $ 4,900,000 15,000,000 $ 10,300,000
Impairment charges of definite and indefinite life intangibles $ 0 $ 0 0 $ 0
Financial Services [Member]        
Goodwill And Intangible Assets [Line Items]        
Additional goodwill recognized     28,768,000  
Real Estate Services [Member]        
Goodwill And Intangible Assets [Line Items]        
Additional goodwill recognized     $ 6,124,000