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Geographic Distribution of Gross Premiums Written (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]          
Gross premiums written, Amount $ 166,515 $ 82,905 $ 309,384 $ 160,102  
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%