Current and Long-Term Obligations - Summary of Long-Term Obligations (Parenthetical) (Detail)	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Feb. 28, 2021
8.75% Senior Secured First Lien Notes due 2026 [Member]
Debt Instrument [Line Items]
Notes issued rate	8.75%	8.75%	8.75%	8.75%
Debt instrument maturity period	2026	2026	2026
6.125% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Notes issued rate	6.125%	6.125%	6.125%
Debt instrument maturity period	2023	2023
6.625% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Notes issued rate	6.625%	6.625%	6.625%
Debt instrument maturity period	2026	2026	2026
First Lien Party City Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument maturity period	2025	2025	2025
First Lien Anagram Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument maturity period	2025	2025	2025
Second Lien Anagram Notes due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument maturity period	2026	2026	2026