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Reinsurance - Additional information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Reinsurer
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Number of reinstatements available | Reinsurer           2          
Primary retention           $ 3,000,000,000          
Percentage comprising aggregate participation           5.40%          
Primary retention of losses and loss adjustment expenses       $ 190,000,000   $ 190,000,000     $ 15,000,000    
Aggregate participation, losses and loss adjustment expenses       3,160,000 $ (2,467,000) 17,291,000 $ (6,831,000)        
Purchase of reinsurance from third party       63,141,000 45,873,000 163,461,000 102,640,000        
Agreement of coverage 3 years                    
Additional maturity period of collateral notes 2 years   2 years                
Reinsurance agreement 3 years                    
Prepaid reinsurance premiums       168,650,000   168,650,000   $ 78,517,000      
Unpaid losses and loss adjustment expenses       125,695,000 $ 74,445,000 125,695,000 $ 74,445,000 83,722,000 51,469,000 $ 117,485,000 $ 61,846,000
Reinsurance payable       177,867,000   177,867,000   60,210,000      
Insurance Claims [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Unpaid losses and loss adjustment expenses       1,000,000   1,000,000          
Notes Due February 2019 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust $ 250,000,000                    
Class D Notes Due February 2019 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust 150,000,000                    
Class E Notes Due February 2019 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust $ 100,000,000                    
Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium                 185,000,000    
Purchase of reinsurance from third party               2,300,000,000      
Unpaid losses and loss adjustment expenses                 990,000,000    
Reinsurance purchase limit       860,000,000   860,000,000          
Reinsurance prepaid amount       825,000,000   825,000,000          
Catastrophe [Member] | 2014 Class A Notes [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust                 200,000,000    
Additional coverage of second catastrophe reinsurance agreement                 $ 50,000,000    
Reinsurance agreement                 3 years    
Coverage of first catastrophe reinsurance agreement                 $ 150,000,000    
Maximum [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Aggregate participation, losses and loss adjustment expenses           11,600,000          
Purchased reinstatement premium           5,300,000          
Osprey [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention                 4,000,000    
Primary retention of losses and loss adjustment expenses                 6,000,000    
Catastrophe excess of loss reinsurance           0     0    
Heritage P&C [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention                 2,000,000    
Catastrophe excess of loss reinsurance                 2,000,000    
Heritage P&C [Member] | Two Thousand Fifteen Class B And C Notes [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Agreement of coverage   3 years                  
Heritage P&C [Member] | Class B Notes Due April 2017 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   $ 97,500,000 $ 97,500,000                
Heritage P&C [Member] | Class C Notes Due April 2017 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   30,000,000 30,000,000                
Zephyr [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Catastrophe excess of loss reinsurance           5,000,000          
Property Per Risk Coverage [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention of losses and loss adjustment expenses               35,000,000      
Coverage limit           9,000,000          
Reinsurance payable       27,000,000   27,000,000          
Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium               440,000,000      
Unpaid losses and loss adjustment expenses               1,800,000,000      
Property Per Risk Coverage [Member] | Osprey [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention               10,000,000      
Primary retention of losses and loss adjustment expenses               20,000,000      
Property Per Risk Coverage [Member] | Heritage P&C [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention               5,000,000      
Catastrophe excess of loss reinsurance               $ 5,000,000      
Property Per Risk Coverage [Member] | Citrus [Member] | Catastrophe [Member] | Two Thousand Fifteen C And B Series Bond And Two Thousand Sixteen Bond [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust       377,500,000   377,500,000          
Additional coverage of second catastrophe reinsurance agreement           $ 200,000,000          
FHCF Layer [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Catastrophe excess of loss reinsurance                 $ 181,000,000    
Percentage of maximum provisional limit                 90.00%    
Estimated provisional limit percentage calculation base amount                 $ 484,000,000    
Purchased coverage price                 48,000,000    
FHCF Layer [Member] | Maximum [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Estimated maximum provisional limit, amount                 436,000,000    
FHCF Layer [Member] | Property Per Risk Coverage [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Percentage comprising aggregate participation           45.00%   75.00%      
Catastrophe excess of loss reinsurance           $ 399,000,000   $ 336,000,000      
Percentage of maximum provisional limit           45.00%   75.00%      
Estimated provisional limit percentage calculation base amount           $ 1,300,000,000   $ 920,000,000      
FHCF Layer [Member] | Property Per Risk Coverage [Member] | Maximum [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Estimated maximum provisional limit, amount               690,000,000      
Shared Layers Above Retention And Below FHCF [Member] | Property Per Risk Coverage [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchase of reinsurance from third party           374,000,000          
Layers Below FHCF [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchase of reinsurance from third party                 185,000,000    
Layers Below FHCF [Member] | Heritage P&C [Member] | Class A Notes Due April Two Thousand Seventeen [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   150,000,000 $ 150,000,000                
Agreement of coverage     3 years                
Reinsurance agreement     3 years                
Layers Below FHCF [Member] | Property Per Risk Coverage [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchase of reinsurance from third party               440,000,000      
Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Coverage of first catastrophe reinsurance agreement           282,000,000          
Prepaid reinsurance premiums       260,000,000   260,000,000          
Aggregate Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Aggregate participation, losses and loss adjustment expenses                 825,000,000    
Catastrophe excess of loss reinsurance                 940,000,000    
Purchase of reinsurance from third party                 105,000,000    
Aggregate Coverage [Member] | Osprey [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Coverage of reinsurance agreement                 20,000,000    
Aggregate Coverage [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Aggregate participation, losses and loss adjustment expenses               1,648,000,000      
Purchased reinstatement premium           682,000,000          
Purchase of reinsurance from third party               $ 125,000,000      
Prepaid reinsurance premiums       460,000,000   460,000,000          
2016-2017 Reinsurance Program [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchase of reinsurance from third party           3,000,000,000          
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Agreement of coverage               3 years      
Reinsurance agreement               3 years      
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class B Notes Due April 2017 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   97,500,000 $ 97,500,000                
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class C Notes Due April 2017 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   30,000,000 30,000,000                
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class A Notes Due April Two Thousand Seventeen [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   150,000,000 150,000,000                
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Notes Due April 2017 [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust   $ 277,500,000 $ 277,500,000                
Cat Bond Layer [Member] | Osprey [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Catastrophe coverage of reinsurance agreement                 25,000,000    
Cat Bond Layer [Member] | Citrus [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Additional coverage of second catastrophe reinsurance agreement                 50,000,000    
Coverage of first catastrophe reinsurance agreement                 $ 150,000,000    
Cat Bond Layer [Member] | Property Per Risk Coverage [Member] | Citrus [Member] | Class A Notes [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Collateralized by a reinsurance trust               $ 150,000,000      
Additional coverage of second catastrophe reinsurance agreement               50,000,000      
Coverage of first catastrophe reinsurance agreement               $ 150,000,000      
Facultative Reinsurance [Member] | Maximum [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Reinsurance payable       10,000,000   10,000,000          
Facultative Reinsurance [Member] | Minimum [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Facultative reinsurance purchase amount           10,000,000          
Florida [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention           1,900,000,000          
Primary retention of losses and loss adjustment expenses       40,000,000   40,000,000          
Florida [Member] | Osprey [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention of losses and loss adjustment expenses       20,000,000   20,000,000          
Florida [Member] | Heritage P&C [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention           15,000,000          
Florida [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Unpaid losses and loss adjustment expenses       1,900,000,000   1,900,000,000          
Florida [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium           260,000,000          
Florida [Member] | A Top And Drop Multi-Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium           22,000,000          
Hawaii [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention           1,100,000,000          
Primary retention of losses and loss adjustment expenses       30,000,000   30,000,000          
Hawaii [Member] | Osprey [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention of losses and loss adjustment expenses       15,000,000   15,000,000          
Hawaii [Member] | Zephyr [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Primary retention           5,000,000          
Hawaii [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Unpaid losses and loss adjustment expenses       $ 1,100,000,000   1,100,000,000          
Hawaii [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium           260,000,000          
Hawaii [Member] | A Top And Drop Multi-Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]                      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]                      
Purchased reinstatement premium           $ 22,000,000