Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.22.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 30, 2022
Jun. 30, 2021
Entity Listings [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Document Transition Report false    
Entity File Number 001-39939    
Entity Registrant Name FORTISTAR SUSTAINABLE SOLUTIONS CORP.    
Entity Central Index Key 0001822862    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-2693583    
Entity Address, Address Line One One North Lexington Avenue    
Entity Address, City or Town White Plains    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10601    
City Area Code 914    
Local Phone Number 421-4900    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company true    
Entity Public Float     $ 265,477,500
Auditor Name Marcum LLP    
Auditor Location New York, NY    
Auditor Firm ID 688    
Units [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant    
Trading Symbol FSSIU    
Security Exchange Name NASDAQ    
Class A Common Stock [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Trading Symbol FSSI    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   25,875,000  
Class B Common Stock [Member]      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   6,468,750  
Redeemable Warrants [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share    
Trading Symbol FSSIW    
Security Exchange Name NASDAQ