Acquisition - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions		6 Months Ended		12 Months Ended
	Nov. 14, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Aggregate purchase price		$ 5,900
Deferred payments of previous acquisitions		2,100
Aggregate purchase price		$ 7,954	$ 189,850	$ 3,670,000
Cash acquired				$ 165,800
Issuance of new debt in acquisition	$ 2,400,000
Comdata Inc. [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 3,420,000
Business acquisition date	Nov. 14, 2014
Ceridian Llc [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Common shares issued to finance acquisition	7.6