The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Recent Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings	$ 131,419		$ 575,965
ASU 2019-12 \| Revision of Prior Period, Change in Accounting Principle, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings		$ 0