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Information about Geographic Areas - Additional Information (Detail) - Foreign Countries [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net carrying value of long lived assets	$ 8,727	$ 4,549
External Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 22,819	$ 34,517	$ 35,146

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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