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Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Acquired Intangible Assets Amortization [Line Items]    
Net Value $ 26,417 $ 17,636
American Reliable Insurance Company    
Acquired Intangible Assets Amortization [Line Items]    
Cost 32,000  
Accumulated Amortization 22,954  
Net Value $ 9,046  
American Reliable Insurance Company | State insurance licenses    
Acquired Intangible Assets Amortization [Line Items]    
Useful Life Indefinite  
Cost and Net Value $ 5,000  
Value of Business Acquired | American Reliable Insurance Company    
Acquired Intangible Assets Amortization [Line Items]    
Cost 25,500  
Accumulated Amortization (22,823)  
Net Value $ 2,677  
Value of Business Acquired | American Reliable Insurance Company | Maximum    
Acquired Intangible Assets Amortization [Line Items]    
Useful Life 1 year  
Agent Relationships | American Reliable Insurance Company    
Acquired Intangible Assets Amortization [Line Items]    
Useful Life 10 years  
Cost $ 900  
Accumulated Amortization (67)  
Net Value 833  
Trade names | American Reliable Insurance Company    
Acquired Intangible Assets Amortization [Line Items]    
Cost 600  
Accumulated Amortization (64)  
Net Value $ 536  
Trade names | American Reliable Insurance Company | Minimum    
Acquired Intangible Assets Amortization [Line Items]    
Useful Life 7 years  
Trade names | American Reliable Insurance Company | Maximum    
Acquired Intangible Assets Amortization [Line Items]    
Useful Life 8 years