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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%

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