Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
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Fair value of financial and nonfinancial obligations.

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Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Predecessor Company
Assets measured at fair value
Marketable securities held in Trust Account		$ 453,742,245	$ 452,816,525
Fair Value, Recurring [Member]
Assets measured at fair value
Assets measured at fair value	$ 206,125,000		190,344,000
Liabilities measured at fair value
Liabilities measured at fair value	47,783,000		50,926,000
Fair Value, Recurring [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value
Liabilities measured at fair value	1,882,000		3,277,000
Fair Value, Recurring [Member] \| Contingent Consideration Liabilities [Member]
Liabilities measured at fair value
Liabilities measured at fair value	45,901,000		47,649,000
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Assets measured at fair value	204,301,000		184,224,000
Fair Value, Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Predecessor Company
Assets measured at fair value
Marketable securities held in Trust Account		453,742,245	452,816,525
Assets measured at fair value		$ 453,742,245	452,816,525
Fair Value, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Assets measured at fair value	1,824,000
Liabilities measured at fair value
Liabilities measured at fair value	1,882,000		3,277,000
Fair Value, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Derivative Financial Instruments, Liabilities [Member]
Liabilities measured at fair value
Liabilities measured at fair value	1,882,000		3,277,000
Fair Value, Recurring [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Assets measured at fair value			6,120,000
Liabilities measured at fair value
Liabilities measured at fair value	45,901,000		47,649,000
Fair Value, Recurring [Member] \| Significant Other Unobservable Inputs (Level 3) [Member] \| Contingent Consideration Liabilities [Member]
Liabilities measured at fair value
Liabilities measured at fair value	45,901,000		47,649,000
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Assets measured at fair value
Assets measured at fair value	204,301,000		184,224,000
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member] \| Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Assets measured at fair value	204,301,000		184,224,000
Fair Value, Recurring [Member] \| Derivative Financial Instruments [Member]
Assets measured at fair value
Assets measured at fair value	1,824,000
Fair Value, Recurring [Member] \| Derivative Financial Instruments [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Assets measured at fair value	$ 1,824,000
Fair Value, Recurring [Member] \| Contingent Consideration Receivable [Member]
Assets measured at fair value
Assets measured at fair value			6,120,000
Fair Value, Recurring [Member] \| Contingent Consideration Receivable [Member] \| Significant Other Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Assets measured at fair value			$ 6,120,000