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Commitments and Contingencies (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 07, 2015
Plaintiff
Apr. 21, 2015
Plaintiff
Nov. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Loss Contingencies [Line Items]            
Rental expenses       $ 4.3 $ 3.7 $ 3.4
Minimum aggregate rental payments required under operating lease, 2016       4.8    
Minimum aggregate rental payments required under operating lease, 2017       5.0    
Minimum aggregate rental payments required under operating lease, 2018       4.5    
Minimum aggregate rental payments required under operating lease, 2019       2.9    
Minimum aggregate rental payments required under operating lease, 2020       2.4    
Thereafter       $ 3.2    
Virtus Investment Partners Inc Securities Litigation [Member]            
Loss Contingencies [Line Items]            
Number of plaintiffs | Plaintiff   3        
Mark Youngers v Virtus Investment Partners, Inc et al [Member]            
Loss Contingencies [Line Items]            
Number of plaintiffs | Plaintiff 3          
Unfavorable Regulatory Action [Member]            
Loss Contingencies [Line Items]            
Loss contingency     $ 16.5