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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Mar. 31, 2018 USD ($) Security	Dec. 31, 2017 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	498	306
Less than 12 months, Fair value	$ 412,838	$ 345,882
Less than 12 months, Unrealized losses	$ (6,147)	$ (2,359)
12 months or longer, Number of issues | Security	87	115
12 months or longer, Fair value	$ 123,393	$ 172,524
12 months or longer, Unrealized losses	$ (4,231)	$ (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	10	7
Less than 12 months, Fair value	$ 40,203	$ 35,464
Less than 12 months, Unrealized losses	$ (553)	$ (301)
12 months or longer, Number of issues | Security	5	9
12 months or longer, Fair value	$ 23,590	$ 24,140
12 months or longer, Unrealized losses	$ (723)	$ (576)
Corporate Bonds [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	314	159
Less than 12 months, Fair value	$ 226,028	$ 142,208
Less than 12 months, Unrealized losses	$ (3,328)	$ (792)
12 months or longer, Number of issues | Security	35	39
12 months or longer, Fair value	$ 31,603	$ 29,796
12 months or longer, Unrealized losses	$ (1,005)	$ (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	102	83
Less than 12 months, Fair value	$ 140,047	$ 137,481
Less than 12 months, Unrealized losses	$ (2,090)	$ (955)
12 months or longer, Number of issues | Security	47	37
12 months or longer, Fair value	$ 68,200	$ 70,218
12 months or longer, Unrealized losses	$ (2,503)	$ (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	$ 3,289	$ 28,265
Less than 12 months, Unrealized losses	$ (47)	$ (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	66	21
Less than 12 months, Fair value	$ 3,271	$ 2,464
Less than 12 months, Unrealized losses	$ (129)	$ (65)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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 investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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