Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 28, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Fiscal Year Focus	2019
Document Period End Date	Dec. 31, 2019
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Registrant Name	Party City Holdco Inc.
Entity Central Index Key	0001592058
Trading Symbol	PRTY
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		94,491,352
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	001-37344
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-0539758
Entity Address, Address Line One	80 Grasslands Road
Entity Address, State or Province	NY
City Area Code	914
Local Phone Number	345-2020
Entity Address, Postal Zip Code	10523
Entity Address, City or Town	Elmsford
Entity Shell Company	false
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 428,960,763