Fair Value Option - Additional Information (Detail) - USD ($)		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of financial instruments more than one day past due	[1]		$ 1,088,000
Corporate Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of financial instruments more than one day past due		$ 0	0
Fair value of financial instruments with non-accrual status		$ 0	0
Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of financial instruments more than one day past due			0
Fair value of financial instruments with non-accrual status			$ 0

[1] Corporate Loans and Corporate Bonds within CLO assets are classified as past due if contractual payments are more than one day past due.