Retirement Plans - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) Age	Dec. 31, 2019 USD ($)
Compensation And Retirement Disclosure [Abstract]
Age for benefits \| Age	65
Defined contribution plan, cost recognized \| $	$ 1.3	$ 1.5

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration