| Cover | Feb. 13, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 13, 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-41075 |
| Entity Registrant Name | SEAPORT GLOBAL ACQUISITION II CORP. |
| Entity Central Index Key | 0001869824 |
| Entity Tax Identification Number | 86-1326052 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 360 Madison Avenue |
| Entity Address, Address Line Two | 23rd Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10017 |
| City Area Code | 212 |
| Local Phone Number | 616-7700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A Common Stock and one-half of one redeemable Warrant [Member] | |
| Document Information [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 | SGIIU |
| Security Exchange Name | NASDAQ |
| Class A Common Stock, par value $0.0001 per share [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | SGII |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share |
| Trading Symbol | SGIIW |
| Security Exchange Name | NASDAQ |
