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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Sep. 30, 2018 USD ($) Security	Dec. 31, 2017 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	608	306
Less than 12 months, Fair value	$ 476,031	$ 345,882
Less than 12 months, Unrealized losses	$ (6,832)	$ (2,359)
12 months or longer, Number of issues | Security	176	115
12 months or longer, Fair value	$ 201,926	$ 172,524
12 months or longer, Unrealized losses	$ (7,029)	$ (3,601)
U.S. Government Obligations and Agencies [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	5	7
Less than 12 months, Fair value	$ 15,734	$ 35,464
Less than 12 months, Unrealized losses	$ (313)	$ (301)
12 months or longer, Number of issues | Security	11	9
12 months or longer, Fair value	$ 40,389	$ 24,140
12 months or longer, Unrealized losses	$ (1,146)	$ (576)
Corporate Bonds [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	413	159
Less than 12 months, Fair value	$ 316,750	$ 142,208
Less than 12 months, Unrealized losses	$ (4,599)	$ (792)
12 months or longer, Number of issues | Security	66	39
12 months or longer, Fair value	$ 51,245	$ 29,796
12 months or longer, Unrealized losses	$ (1,566)	$ (516)
Mortgage-Backed and Asset-Backed Securities [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	86	83
Less than 12 months, Fair value	$ 135,530	$ 137,481
Less than 12 months, Unrealized losses	$ (1,643)	$ (955)
12 months or longer, Number of issues | Security	98	37
12 months or longer, Fair value	$ 109,884	$ 70,218
12 months or longer, Unrealized losses	$ (4,280)	$ (1,568)
Municipal Bonds [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	6	36
Less than 12 months, Fair value	$ 3,278	$ 28,265
Less than 12 months, Unrealized losses	$ (123)	$ (246)
12 months or longer, Number of issues | Security		30
12 months or longer, Fair value		$ 48,370
12 months or longer, Unrealized losses		$ (941)
Redeemable Preferred Stock [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	98	21
Less than 12 months, Fair value	$ 4,739	$ 2,464
Less than 12 months, Unrealized losses	$ (154)	$ (65)
12 months or longer, Number of issues | Security	1
12 months or longer, Fair value	$ 408
12 months or longer, Unrealized losses	$ (37)

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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+ 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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-Publisher FASB
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-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

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-Publisher FASB
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-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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