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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost $ 500,930 $ 426,568
Fair Value 498,129 423,581
Mortgage-backed securities [Member] | Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 72,375 64,905
Fair Value 72,204 64,619
Mortgage-backed securities [Member] | Non Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 10,459 8,053
Fair Value 10,372 7,987
Asset-backed securities [Member] | Auto Loans [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 14,818 16,551
Fair Value 14,857 16,556
Asset-backed securities [Member] | Credit Card Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 17,044 13,481
Fair Value 17,042 13,457
Asset-backed securities [Member] | Other Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 4,600 4,599
Fair Value 4,613 4,604
Mortgage-Backed and Asset-Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 119,296 107,589
Fair Value $ 119,088 $ 107,223