Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 3,310,649	$ 3,451,149
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	167,394	133,052
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	313,685	1,139,101
Non - credit other - than - temporary Impairments	58	32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	981	27,298
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	26,158	359,943
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	368	10,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,349	38,195
Available-for-sale Securities, Current	3,476,694	3,546,006
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	3,476,694
Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	664,423	430,405
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	41	23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	137,514	115,374
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	23	97
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	23	97
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	664,441	430,331
Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,561,278	3,020,744
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	167,353	133,029
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	176,171	1,023,727
Non - credit other - than - temporary Impairments	58	32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	958	27,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	26,158	359,943
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	368	10,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,326	38,098
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	2,727,305	3,115,675
Fixed Income Securities [Member] \| Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	268,455	882,631
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	36,953	14,364
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	537,904
Non - credit other - than - temporary Impairments	0	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	15,878
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,436	28,533
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	280	1,198
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	280	17,076
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	305,128	879,919
Fixed Income Securities [Member] \| Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,431,002	1,288,882
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	38,536	6,444
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	63,985	306,506
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	267	8,634
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	4,987	190,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	21	8,570
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	288	17,204
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	1,469,250	1,278,122
Fixed Income Securities [Member] \| Foreign Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	41,485	30,496
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,005	399
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,122	1,161
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	312	5,163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	60
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2	61
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	42,488	30,834
Fixed Income Securities [Member] \| US Government Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	151,744	93,636
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,390	1,371
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,741	5,643
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61	135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,273	58,495
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	13	478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	74	613
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	156,060	94,394
Fixed Income Securities [Member] \| Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	206,211	221,825
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	51,187	37,575
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,112	34,852
Non - credit other - than - temporary Impairments	58	27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	58	793
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	58	793
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	257,340	258,607
Fixed Income Securities [Member] \| Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	148,385	133,075
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	23	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	99,144	123,848
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	542	1,727
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,969	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	573	1,727
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	147,835	131,356
Fixed Income Securities [Member] \| Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	313,996	370,199
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	35,259	72,868
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6,067	13,813
Non - credit other - than - temporary Impairments	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	29	33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,181	77,479
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	22	591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	51	624
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	349,204	442,443
Fixed Income Investments And Other Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,225,701
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	167,394
Non - credit other - than - temporary Impairments	58
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,349
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	3,391,746
Collateral Pledged [Member] \| Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	84,948	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Non - credit other - than - temporary Impairments	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	84,948	$ 0
Collateral Pledged [Member] \| Fixed Income Securities [Member] \| US Government Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	84,948
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Non - credit other - than - temporary Impairments	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	84,948
Asset Pledged as Collateral [Member] \| Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 84,948

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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