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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, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 834,817	$ 831,127
Fair Value	840,028	820,438
Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	330,925	312,840
Fair Value	331,767	309,597
Agency [Member] | Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	152,861	139,418
Fair Value	151,214	136,291
Non Agency [Member] | Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71,863	61,689
Fair Value	74,084	61,933
Auto Loan Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,808	53,449
Fair Value	49,917	53,341
Credit Card Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,750	29,594
Fair Value	27,809	29,366
Other Receivables [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,643	28,690
Fair Value	$ 28,743	$ 28,666

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

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+ References

No definition available.

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