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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, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	$ 668,868	$ 653,715
Fair Value	656,762	649,334
Mortgage-backed securities [Member] | Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	140,252	118,014
Fair Value	137,247	116,014
Mortgage-backed securities [Member] | Non Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	29,023	17,676
Fair Value	28,608	17,488
Asset-backed securities [Member] | Auto Loan Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	30,187	35,105
Fair Value	29,845	34,962
Asset-backed securities [Member] | Credit Card Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	16,258	38,844
Fair Value	16,074	38,719
Asset-backed securities [Member] | Other Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	26,772	12,317
Fair Value	25,658	12,269
Mortgage-Backed and Asset-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	242,492	221,956
Fair Value	$ 237,432	$ 219,452

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

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- Definition

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