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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Jun. 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	528	306
Less than 12 months, Fair value	$ 444,952	$ 345,882
Less than 12 months, Unrealized losses	$ (8,107)	$ (2,359)
12 months or longer, Number of issues | Security	102	115
12 months or longer, Fair value	$ 138,026	$ 172,524
12 months or longer, Unrealized losses	$ (4,772)	$ (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	9	7
Less than 12 months, Fair value	$ 35,148	$ 35,464
Less than 12 months, Unrealized losses	$ (608)	$ (301)
12 months or longer, Number of issues | Security	8	9
12 months or longer, Fair value	$ 22,564	$ 24,140
12 months or longer, Unrealized losses	$ (766)	$ (576)
Corporate Bonds [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	346	159
Less than 12 months, Fair value	$ 266,868	$ 142,208
Less than 12 months, Unrealized losses	$ (5,103)	$ (792)
12 months or longer, Number of issues | Security	33	39
12 months or longer, Fair value	$ 31,018	$ 29,796
12 months or longer, Unrealized losses	$ (1,087)	$ (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	100	83
Less than 12 months, Fair value	$ 135,607	$ 137,481
Less than 12 months, Unrealized losses	$ (2,172)	$ (955)
12 months or longer, Number of issues | Security	61	37
12 months or longer, Fair value	$ 84,444	$ 70,218
12 months or longer, Unrealized losses	$ (2,919)	$ (1,568)
Municipal Bonds [Member] | Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Number of issues | Security	7	36
Less than 12 months, Fair value	$ 3,521	$ 28,265
Less than 12 months, Unrealized losses	$ (81)	$ (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	$ 3,808	$ 2,464
Less than 12 months, Unrealized losses	$ (143)	$ (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.

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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.

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