Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 21, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Entity File Number	001-40164
Entity Registrant Name	G&P ACQUISITION CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-4357324
Entity Address, Address Line One	222 Bellevue Avenue
Entity Address, City or Town	Newport
Entity Address State Or Province	RI
Entity Address, Postal Zip Code	02840
City Area Code	212
Local Phone Number	415-6500
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Central Index Key	0001839121
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Transition Report	false
Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one redeemable warrant
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one redeemable warrant
Trading Symbol	GAPA.U
Security Exchange Name	NYSE
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A common stock, $0.0001 par value
Trading Symbol	GAPA
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		17,500,000
Warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share
Trading Symbol	GAPA WS
Security Exchange Name	NYSE
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,375,000