Goodwill - Schedule of Changes in Goodwill by Reporting Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Goodwill By Segment [Line Items]
Beginning balance	$ 1,656,950
Goodwill and intangibles impairment	556,056
Ending balance	1,072,330	$ 1,656,950
Total ending balance, both segments	1,656,950	1,656,950
Wholesale Segment [Member]
Schedule Of Goodwill By Segment [Line Items]
Beginning balance	510,490	513,946
Allocation of Goodwill from/to Retail segment	42,230
Goodwill and intangibles impairment	(60,427)
Foreign currency translation	1,139	(2,750)
Ending balance	493,432	510,490
Total ending balance, both segments	493,432	513,946
Wholesale Segment [Member] | Granmark [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition		(1,115)
Wholesale Segment [Member] | Print Appeal Inc [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition		277
Wholesale Segment [Member] | Other Acquisitions [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition		132
Retail Segment [Member]
Schedule Of Goodwill By Segment [Line Items]
Beginning balance	1,146,460	1,105,307
Allocation of Goodwill from/to Retail segment	(42,230)
Goodwill and intangibles impairment	(495,629)
Foreign currency translation	606	(1,648)
Ending balance	578,898	1,146,460
Total ending balance, both segments	578,898	1,105,307
Retail Segment [Member] | Store Acquisitions [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition	2,557	$ 42,801
Retail Segment [Member] | Acquisitions [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition	15,375
Retail Segment [Member] | Sale of Canadianbased Party City stores [Member]
Schedule Of Goodwill By Segment [Line Items]
Business acquisition	$ (48,241)