| Document and Entity Information | Jan. 27, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | DUCOMMUN INC /DE/ |
| Amendment Flag | false |
| Entity Central Index Key | 0000030305 |
| Document Type | 8-K |
| Document Period End Date | Jan. 27, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-08174 |
| Entity Tax Identification Number | 95-0693330 |
| Entity Address, Address Line One | 200 Sandpointe Avenue |
| Entity Address, Address Line Two | Suite 700 |
| Entity Address, City or Town | Santa Ana |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92707-5759 |
| City Area Code | (657) |
| Local Phone Number | 335-3665 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $.01 par value per share |
| Trading Symbol | DCO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
