Debt - Summary of Company's Long-term Debt (Parenthetical) (Detail) - First Lien Term Loan Due June 19, 2024 [Member]	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Long-term debt, Maturity date	Jun. 19, 2024
Debt instrument interest rate during period	4.50%	4.68%

The average effective interest rate during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1F
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration