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Business Combinations (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 10, 2015
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]            
Goodwill     $ 6,788 $ 6,701 $ 5,260 $ 5,260
Redeemable noncontrolling interest, EBITDA multiplier for redemption     6      
Redeemable noncontrolling interest, redemption liability     $ 3,500      
Virtus ETF Solutions [Member]            
Business Acquisition [Line Items]            
Minority shareholders ownership percentage     42.50%      
Virtus ETF Solutions [Member]            
Business Acquisition [Line Items]            
Purchase price $ 4,800          
Goodwill 1,500          
Other intangible assets $ 2,400          
RidgeWorth Holdings, LLC [Member] | Forecast [Member]            
Business Acquisition [Line Items]            
Purchase price   $ 472,000