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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Mar. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	67	331
Less than 12 months, Fair value	$ 29,286	$ 279,093
Less than 12 months, Unrealized losses	$ (655)	$ (4,063)
12 months or longer, Number of issues | security	309	281
12 months or longer, Fair value	$ 344,163	$ 337,226
12 months or longer, Unrealized losses	$ (5,057)	$ (8,548)
Fixed Maturities [Member] | U.S. Government Obligations and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	0
Less than 12 months, Fair value	$ 1,300	$ 0
Less than 12 months, Unrealized losses	$ (3)	$ 0
12 months or longer, Number of issues | security	9	13
12 months or longer, Fair value	$ 46,124	$ 56,531
12 months or longer, Unrealized losses	$ (651)	$ (1,039)
Fixed Maturities [Member] | Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	24	228
Less than 12 months, Fair value	$ 11,810	$ 210,152
Less than 12 months, Unrealized losses	$ (39)	$ (3,318)
12 months or longer, Number of issues | security	190	160
12 months or longer, Fair value	$ 154,760	$ 131,225
12 months or longer, Unrealized losses	$ (1,604)	$ (3,418)
Fixed Maturities [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	13	36
Less than 12 months, Fair value	$ 13,011	$ 57,487
Less than 12 months, Unrealized losses	$ (43)	$ (196)
12 months or longer, Number of issues | security	101	103
12 months or longer, Fair value	$ 141,496	$ 148,436
12 months or longer, Unrealized losses	$ (2,700)	$ (3,959)
Fixed Maturities [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	6
Less than 12 months, Fair value	$ 272	$ 3,362
Less than 12 months, Unrealized losses	$ (8)	$ (43)
12 months or longer, Number of issues | security	0	0
12 months or longer, Fair value	$ 0	$ 0
12 months or longer, Unrealized losses	$ 0	$ 0
Fixed Maturities [Member] | Redeemable Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	28	61
Less than 12 months, Fair value	$ 2,893	$ 8,092
Less than 12 months, Unrealized losses	$ (562)	$ (506)
12 months or longer, Number of issues | security	9	5
12 months or longer, Fair value	$ 1,783	$ 1,034
12 months or longer, Unrealized losses	$ (102)	$ (132)

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), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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