Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Total revenues	$ 561,011	$ 544,878	$ 1,068,835	$ 1,021,877
Expenses:
Cost of sales	329,477	321,900	646,443	620,619
Wholesale selling expenses	17,256	16,045	36,043	31,672
Retail operating expenses	92,094	90,512	181,186	181,242
Franchise expenses	3,980	3,713	7,762	7,030
General and administrative expenses	45,326	39,655	93,991	87,792
Art and development costs	5,732	5,942	11,705	11,740
Development stage expenses	1,695	6,412	3,998	6,412
Total expenses	495,560	484,179	981,128	946,507
Income from operations	65,451	60,699	87,707	75,370
Interest expense, net	25,501	21,294	48,776	41,986
Other expense (income), net	2,532	(895)	3,380	267
Income before income taxes	37,418	40,300	35,551	33,117
Income tax expense	9,370	15,318	8,666	12,818
Net income	28,048	24,982	26,885	20,299
Add: Net income attributable to redeemable securities holder	410		410
Less: Net loss attributable to noncontrolling interests	(29)		(59)
Net income attributable to common shareholders of Party City Holdco Inc.	$ 28,487	$ 24,982	$ 27,354	$ 20,299
Net income per share attributable to common shareholders of Party City Holdco Inc. - Basic	$ 0.30	$ 0.21	$ 0.28	$ 0.17
Net income per share attributable to common shareholders of Party City Holdco Inc. - Diluted	$ 0.29	$ 0.21	$ 0.28	$ 0.17
Weighted-average number of common shares-Basic	96,453,884	119,528,147	96,426,235	119,526,007
Weighted-average number of common shares-Diluted	97,688,233	120,943,745	97,669,309	120,903,032
Dividends declared per share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Comprehensive income	$ 18,825	$ 31,985	$ 22,892	$ 30,510
Add: Comprehensive income attributable to redeemable securities holder	410		410
Less: Comprehensive loss attributable to noncontrolling interests	(55)		(73)
Comprehensive income attributable to common shareholders of Party City Holdco Inc.	19,290	31,985	23,375	30,510
Net Sales [Member]
Revenues:
Revenues	558,101	541,653	1,063,209	1,015,616
Royalties and Franchise Fees [Member]
Revenues:
Revenues	$ 2,910	$ 3,225	$ 5,626	$ 6,261