Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 11, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Capitol Acquisition Corp. II
Entity Central Index Key	0001512499
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		25,000,000