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Commitments and Contingencies (Detail)
$ in Millions
12 Months Ended
Jul. 01, 2016
claim
defendant
Jun. 07, 2015
plaintiff
Apr. 21, 2015
plaintiff
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]            
Rental expenses       $ 6.2 $ 4.4 $ 4.3
Minimum aggregate rental payments required under operating lease, 2018       6.8    
Minimum aggregate rental payments required under operating lease, 2019       5.1    
Minimum aggregate rental payments required under operating lease, 2020       4.3    
Minimum aggregate rental payments required under operating lease, 2021       2.9    
Minimum aggregate rental payments required under operating lease, 2022       1.8    
Thereafter       $ 3.5    
Virtus Investment Partners Inc Securities Litigation            
Loss Contingencies [Line Items]            
Number of plaintiffs | plaintiff     3      
Number of defendants dismissed | defendant 1          
Mark Youngers v Virtus Investment Partners, Inc et al            
Loss Contingencies [Line Items]            
Number of plaintiffs | plaintiff   3        
Number of defendants dismissed | defendant 10          
Claims dismissed | claim 4