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Reinsurance - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Reinsurers
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Reinsurers
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Reinsurers
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]          
Number of reinsurers | Reinsurers 21   21   28
Reinsurance recoverable $ 0   $ 0   $ 0
Credit risk associated with reinsurance receivables 0   0   0
Recoveries pertaining to reinsurance contracts 0 $ 0 0 $ 0  
Net reduction in ceded premiums 6,241,000 $ 5,056,000 12,614,000 $ 10,540,000  
Other assets 48,151,000   48,151,000   35,587,000
Prepaid reinsurance premiums 33,418,000   33,418,000   34,096,000
Reinsurance [Member]          
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]          
Other assets 41,503,000   41,503,000   28,596,000
Prepaid reinsurance premiums $ 5,691,000   $ 5,691,000   $ 5,983,000