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Credit Insurance Products and Reinsurance of Certain Risks - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Insurance [Line Items]          
Increase in letter of credit secured by cash deposit $ 2,900,000        
Letter of credit secured by cash deposit   $ 2,900,000 $ 2,900,000    
Restricted cash   10,506,000 $ 10,506,000 $ 1,901,000  
Term of CPI Policy     1 year    
CPI policy commission earned   0      
Recognized revenue     $ 100,000 200,000 $ 200,000
Letter of Credit [Member]          
Insurance [Line Items]          
Restricted cash   $ 2,900,000 $ 2,900,000 $ 1,900,000