| Cover | Oct. 12, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 12, 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-37344 |
| Entity Registrant Name | PARTY CITY HOLDCO INC. |
| Entity Central Index Key | 0001592058 |
| Entity Tax Identification Number | 46-0539758 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 100 Tice Boulevard |
| Entity Address, City or Town | Woodcliff Lake |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07677 |
| City Area Code | 914 |
| Local Phone Number | 345-2020 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
