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Information for Financial Instruments on Which Fair Value Option was Elected (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	$ (162,983)	$ (325,324)
Debt Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	(10,920)	(26,660)
Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	(151,535)	(301,085)
Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	350
Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	$ (878)	$ 2,421

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- Definition

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- Definition

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No definition available.

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