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Geographic Distribution of Gross Premiums Written (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]          
Gross premiums written, Amount $ 150,148 $ 67,098 $ 459,532 $ 227,200  
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 266,303
Gross premiums written, Percent         100.00%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | TEXAS          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 32,760
Gross premiums written, Percent         12.30%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | CALIFORNIA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 25,556
Gross premiums written, Percent         9.60%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | NORTH CAROLINA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 23,040
Gross premiums written, Percent         8.70%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | ARIZONA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 17,722
Gross premiums written, Percent         6.70%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | LOUISIANA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 17,522
Gross premiums written, Percent         6.60%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | NEW YORK          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 13,408
Gross premiums written, Percent         5.00%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | FLORIDA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 12,361
Gross premiums written, Percent         4.60%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | OKLAHOMA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 9,977
Gross premiums written, Percent         3.70%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | GEORGIA          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 8,768
Gross premiums written, Percent         3.30%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | NEW JERSEY          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 6,925
Gross premiums written, Percent         2.60%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | Subtotal          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 168,039
Gross premiums written, Percent         63.10%
American Reliable Insurance Company | Sales Revenue, Services, Net | Geographic Concentration Risk | All other states          
Business Acquisition [Line Items]          
Gross premiums written, Amount         $ 98,264
Gross premiums written, Percent         36.90%