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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost $ 659,383 $ 650,575
Fair Value 652,962 640,166
Mortgage-backed securities [Member] | Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 111,148 110,724
Fair Value 109,720 109,022
Mortgage-backed securities [Member] | Non Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 18,247 19,408
Fair Value 18,128 19,265
Asset-backed securities [Member] | Auto Loan Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 36,900 37,390
Fair Value 36,857 37,429
Asset-backed securities [Member] | Credit Card Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 38,617 38,640
Fair Value 38,553 38,568
Asset-backed securities [Member] | Other Receivables [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 10,758 10,517
Fair Value 10,743 10,492
Mortgage-Backed and Asset-Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost or Amortized Cost 215,670 216,679
Fair Value $ 214,001 $ 214,776