Description of Organization and Business Operations - Additional Information (Detail)		9 Months Ended
	Feb. 25, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 $ / shares	Dec. 31, 2020 USD ($) $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Proceeds from issuance of IPO		$ 316,250,000
Deferred offering costs non current				$ 120,000
Deferred underwriting commissions	$ 11,100,000	$ 11,068,750
Restricted investments term		185 days
Percentage of the fair value of assets in trust account of the target company net of deferred undrwriting commissions and taxes		0.80
Minimum networth to effect business combination		$ 5,000,001
Percentage of public shares to be redeemed on non completion of business combination		100.00%
Dissolution expense		$ 100,000
Cash in operating bank account		319,896
Working capital		1,200,000
Repayment of note payable to related party		$ 151,790
Business combination, description		ten business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay its income taxes, if any (less up to $100,000 of interest
Trust account description		Company acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended, or the Investment Company Act having a maturity of 185 days or less or in money market funds
Redeeming share percent		15.00%
Minimum [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity metohd investment ownership percentage		50.00%
Shares subject to possible redemption per shares \| $ / shares		$ 10.00
Per share amunt in the trust account for distribution to the public shareholders \| $ / shares		$ 10.00
IPO [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Proceeds from issuance of IPO		$ 316,250,000
Sponsor [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Stock issued during the period value for services rendered		25,000
Proceeds from related party debt		152,000
Repayment of note payable to related party		152,000
Due to related parties		$ 0		$ 0
Sponsor [Member] \| Private Placement Warrants [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Class of warrants and rights issued during the period \| shares		5,550,000
Class of warrants and rights issued, price per warrant \| $ / shares		$ 1.50
Proceeds from issuance of warrants		$ 8,300,000
Class A ordinary shares [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Shares subject to possible redemption per shares \| $ / shares		$ 10.00	$ 10.00	$ 10.00
Class A ordinary shares [Member] \| IPO [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Stock issued during period shares \| shares	31,625,000
Shares issued price per share \| $ / shares	$ 10.00	$ 10.00
Proceeds from issuance of IPO	$ 316,300,000	$ 316,300,000
Deferred offering costs non current	$ 18,000,000.0
Class A ordinary shares [Member] \| Over-Allotment Option [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Stock issued during period shares \| shares	4,125,000

ARCTOS NORTHSTAR ACQUISITION CORP. 10-Q/A