v3.26.1
Cover - USD ($)
12 Months Ended
Dec. 31, 2025
Mar. 27, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Information [Line Items]      
Entity Registrant Name GESHER ACQUISITION CORP. II    
Entity Central Index Key 0002044635    
Entity File Number 001-42562    
Entity Tax Identification Number 98-1833264    
Entity Incorporation, State or Country Code E9    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company true    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 145,906,250
Entity Incorporation, Date of Incorporation Aug. 29, 2024    
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 3141 Walnut Street    
Entity Address, Address Line Two Suite 203b    
Entity Address, City or Town Denver    
Entity Address, State or Province CO    
Entity Address, Postal Zip Code 80205    
Entity Phone Fax Numbers [Line Items]      
City Area Code (212)    
Local Phone Number 993-1560    
Units, each consisting of one Class A Ordinary Share and one-half of one redeemable Warrant      
Entity Listings [Line Items]      
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share and one-half of one redeemable Warrant    
Trading Symbol GSHRU    
Security Exchange Name NASDAQ    
Class A Ordinary Shares, par value $0.0001 per share      
Entity Listings [Line Items]      
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share    
Trading Symbol GSHR    
Security Exchange Name NASDAQ    
Redeemable Warrants, each whole Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share      
Entity Listings [Line Items]      
Title of 12(b) Security Redeemable Warrants, each whole Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share    
Trading Symbol GSHRW    
Security Exchange Name NASDAQ    
Class A Ordinary Shares      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   14,940,625  
Class B Ordinary Shares      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   5,513,483