| Document And Entity Information Document And Entity Information | Feb. 03, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 03, 2025 |
| Entity Registrant Name | EMCOR Group, Inc. |
| Entity Central Index Key | 0000105634 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-8267 |
| Entity Tax Identification Number | 11-2125338 |
| Entity Address, Address Line One | 301 Merritt Seven |
| Entity Address, City or Town | Norwalk, |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06851-1092 |
| City Area Code | (203) |
| Local Phone Number | 849-7800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | EME |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
