Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Reconciliation Between Basic and Diluted Income Per Share

A reconciliation between basic and diluted income per share is as follows:

	Fiscal Year Ended December 31,
	2019			2018		2017
Net (loss) income attributable to common shareholders of Party City Holdco Inc.:	$	(532,495	)	$	123,259	$	215,340
Weighted average shares—Basic:		93,295,692			96,133,144		118,589,421
Effect of dilutive restricted stock units:		—			9,661		—
Effect of dilutive stock options:		—			1,128,245		1,304,600
Weighted average shares—Diluted:		93,295,692			97,271,050		119,894,021
Net (loss) income per share attributable to common shareholders of Party City Holdco Inc.—Basic:	$	(5.71	)	$	1.28	$	1.81
Net (loss) income per share attributable to common shareholders of Party City Holdco Inc.—Diluted:	$	(5.71	)	$	1.27	$	1.79