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Realized and Net Change in Unrealized Gains (Losses) on Financial Instruments on Financial Instruments on Which Fair Value Option was Elected (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Realized Gains (Losses) | Debt Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	$ (3,325)	$ 15	$ (3,360)	$ 827
Realized Gains (Losses) | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(4,714)	1,089	(9,683)	(27,628)
Realized Gains (Losses) | Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(747)		(1,831)
Realized Gains (Losses) | Equity and Preferred Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	9,907		9,908
Realized Gains (Losses) | Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(10,549)	1,074	(14,400)	(4,399)
Realized Gains (Losses) | Corporate Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments				(24,056)
Net Change In Unrealized Gains (Losses)
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	21,830	16,846	(95,874)	60,460
Net Change In Unrealized Gains (Losses) | Debt Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	1,817	(2,878)	16,749	(2,297)
Net Change In Unrealized Gains (Losses) | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(17,822)	(30,869)	198,517	(1,511)
Net Change In Unrealized Gains (Losses) | Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(1,897)		(2,657)
Net Change In Unrealized Gains (Losses) | Equity and Preferred Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(67)	(2,095)	22,298	(1,867)
Net Change In Unrealized Gains (Losses) | Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(18,025)	(25,896)	161,777	(7,046)
Net Change In Unrealized Gains (Losses) | Corporate Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments				9,693
Net Change In Unrealized Gains (Losses) | Senior Secured Notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	6,667		(44,893)
Net Change In Unrealized Gains (Losses) | Subordinated Notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	15,163	$ 16,846	(50,981)	60,460
Net Change In Unrealized Gains (Losses) | Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	$ 350		$ 350	$ 6

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

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