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Investment income - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2014
Net Investment Income [Line Items]        
Proceeds from the sales of investments available-for-sale $ 69.3 $ 58.1 $ 82.0  
Impairment of an intangible asset 1.8 1.7    
Realized gains from sale of debt and equity investments available-for-sale 2.4 1.1 2.7  
Gain on sale of office buildings 1.5      
Realized gain from the reduction in the fair value of contingent consideration liability   5.6    
Realized gain from sale of a business   3.8    
Impairment of a cost basis investment   1.0 1.0  
Non cash charge on early retirement of convertible senior notes     5.4  
Loss on sale of equity investment     1.5  
Gain on non title related insurance policy proceeds     2.3  
Realized gain on sale of real estate     1.9  
Convertible Notes Payable        
Net Investment Income [Line Items]        
Convertible senior notes     $ 37.8 $ 27.2
Facility Closing        
Net Investment Income [Line Items]        
Charges related to office closures 1.4 $ 1.9    
Investment and Other (Losses) Gains        
Net Investment Income [Line Items]        
Recognized other than temporary impairment $ 2.7