Organization and Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020 USD ($) subsidiary
Accounting Policies [Abstract]
Number of wholly owned Irish subsidiaries | subsidiary	2
Accrued interest receivables write-off threshold period	90 days
Accrued interest receivables	$ 3,500,000
Accrued interest receivables write-off	$ 0