Acquisitions and Investments - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended	12 Months Ended				9 Months Ended				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Masternaut Group Holdings Limited [Member]	Dec. 31, 2013 Minimum [Member] Other Noncurrent Assets [Member]	Dec. 31, 2013 Maximum [Member] Other Noncurrent Assets [Member]	Sep. 30, 2014 Comdata Inc. [Member] Employee Customer	Sep. 30, 2014 Ceridian Llc [Member] Common Stock [Member]	Sep. 30, 2014 All 2013 Acquisitions [Member]	Dec. 31, 2013 All 2013 Acquisitions [Member]	Mar. 31, 2015 All 2013 Acquisitions [Member] Earnings Growth Rate [Member] Monte Carlo Simulation [Member] Scenario, Forecast [Member]	Dec. 31, 2013 All 2013 Acquisitions [Member] Accrued Expenses and Other Long Term Liabilities [Member]
Loans At Acquisition Date [Line Items]
Aggregate purchase price	$ 238,700,000	$ 849,000,000
Deferred payment	23,200,000	36,800,000
Equity method investment, ownership percentage			44.00%
Payment to acquire business						3,450,000,000
Business acquisition date						Aug. 12, 2014
Number of employees in business acquisition in other entity						1,300
Business acquisition, value of business held by acquiree						54,000,000,000
Acquisition description of acquired entity						As an issuer and a processor, Comdata provides fleet, virtual card and gift card solutions to over 20,000 customers.
Number of customers of acquiree						20,000
Issuance of new debt in acquisition	2,400,000,000
Issuance of common stock in acquisition							7.3
Contingent earn-out payment	78,611,000	80,476,000						49,200,000	83,100,000		49,200,000
Cash paid for acquisition		35,600,000
Contingent consideration future payments, low range	59,000,000
Contingent consideration future payments, high range	83,000,000
Contingent consideration payable										78,600,000
Uncertain tax positions	21,000,000	21,600,000						13,400,000	13,400,000
Indemnification asset recorded				$ 50,000,000	$ 51,100,000			$ 51,100,000	$ 51,100,000