Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2021
Nov. 16, 2021
Entity Listings [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
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 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  
Entity Shell Company true  
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