| Document and Entity Information | Sep. 08, 2021 |
| Document Type | 8-K |
| Document Period End Date | Sep. 8, 2021 |
| Entity Registrant Name | Loral Space & Communications Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-14180 |
| Entity Tax Identification Number | 87-0748324 |
| Entity Address, Address Line One | 600 Fifth Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10020 |
| City Area Code | 212 |
| Local Phone Number | 697-1105 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001006269 |
| Amendment Flag | false |
| Voting Common Stock [Member] | |
| Title of 12(b) Security | Voting Common Stock |
| Trading Symbol | LORL |
| Security Exchange Name | NASDAQ |
| Preferred Stock Purchase Rights [Member] | |
| Title of 12(b) Security | Preferred Stock Purchase Rights |
| No Trading Symbol Flag | true |
| Security Exchange Name | NASDAQ |
