Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.3.1.900
Subsequent Events - Additional Information (Detail) - USD ($)
Dec. 08, 2015
Dec. 01, 2015
Nov. 23, 2015
Oct. 31, 2015
Apr. 30, 2015
Subsequent Event [Line Items]          
Common stock, par value       $ 0.01 $ 0.01
Subsequent Event | HG Bermuda          
Subsequent Event [Line Items]          
Business combination, aggregate purchase price   $ 493,000,000      
Business acquisition purchase price   $ 275,000,000      
Business combination, Consideration Shares   5,922,136      
Business combination, Consideration Shares value   $ 218,000,000      
Consecutive trading days   20 days      
Common stock, par value   $ 0.01      
Term loan facility initial interest rate     1.34%    
Business combination, committed to retention pool for certain employees   $ 40,000,000      
Subsequent Event | HG Bermuda | Payable within 45 days after November 30, 2017          
Subsequent Event [Line Items]          
Business combination, committed to retention pool for certain employees   50.00%      
Subsequent Event | HG Bermuda | Payable within 45 days after November 30, 2018          
Subsequent Event [Line Items]          
Business combination, committed to retention pool for certain employees   50.00%      
Subsequent Event | HG Bermuda | Indemnity Escrow Shares at Closing          
Subsequent Event [Line Items]          
Business combination, Consideration Shares   835,011      
Subsequent Event | HG Bermuda | Volume Weighted Average Price          
Subsequent Event [Line Items]          
Business combination, Consideration Shares value   $ 200,000,000      
Subsequent Event | HG Bermuda | Maximum | Payable within one year          
Subsequent Event [Line Items]          
Business combination, committed to retention pool for certain employees   5,000,000      
Subsequent Event | HG Bermuda | Foreign Location          
Subsequent Event [Line Items]          
Business acquisition purchase price   $ 54,000,000      
Subsequent Event | HG Bermuda | Term Facility          
Subsequent Event [Line Items]          
Senior unsecured loan, aggregate principal amount     $ 150,000,000    
Line of credit facility, extended maturity date     Sep. 23, 2020    
Installment payable beginning date     Jan. 01, 2016    
Subsequent Event | Dividend Declared          
Subsequent Event [Line Items]          
Dividends payable, declared date Dec. 08, 2015        
Dividends payable, per share amount $ 0.10        
Dividends payable, payable date Jan. 15, 2016        
Dividends declared, record date Dec. 21, 2015