Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2026	May 11, 2026
Document Information Line Items
Entity Central Index Key	0001876716
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Fiscal Year Focus	2026
Document Transition Report	false
Entity Registrant Name	ASPAC II Acquisition Corp.
Entity Incorporation, State or Country Code	D8
Entity File Number	001-41372
Entity Tax Identification Number	00-0000000
Entity Address, Address Line One	289 Beach Road
Entity Address, Address Line Two	#03-01
Entity Address, City or Town	Singapore
Entity Address, Country	SG
Entity Address, Postal Zip Code	199552
City Area Code	(65)
Local Phone Number	6818 5796
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Amendment Flag	false
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant and one right to receive one-tenth of one Class A ordinary share
Document Information Line Items
Title of 12(g) Security	Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant
Trading Symbol	ASUUF
Class A ordinary shares, no par value, included as part of the units
Document Information Line Items
Title of 12(g) Security	Class A ordinary shares, no par value, included as part of the units
Trading Symbol	ASCBF
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units
Document Information Line Items
Title of 12(g) Security	Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units
Trading Symbol	ASCWF
Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units
Document Information Line Items
Title of 12(g) Security	Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units
Trading Symbol	ASCRF
Class A Ordinary Shares
Document Information Line Items
Entity Common Stock, Shares Outstanding		5,243,594
Class B Ordinary Shares
Document Information Line Items
Entity Common Stock, Shares Outstanding		100,000

ASPAC II Acquisition Corp. 10-Q