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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, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost $ 623,851 $ 650,575
Fair Value 619,836 640,166
Mortgage-backed securities [Member] | Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 106,015 110,724
Fair Value 104,863 109,022
Mortgage-backed securities [Member] | Non Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 16,752 19,408
Fair Value 16,682 19,265
Asset-backed securities [Member] | Auto Loan Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 37,216 37,390
Fair Value 37,195 37,429
Asset-backed securities [Member] | Credit Card Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 39,894 38,640
Fair Value 39,872 38,568
Asset-backed securities [Member] | Other Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 11,167 10,517
Fair Value 11,156 10,492
Mortgage-Backed and Asset-Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 211,044 216,679
Fair Value $ 209,768 $ 214,776