Nature of Business and Summary of Significant Accounting Policies - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Goodwill [Line Items]
Gross Balance prior to the end of year						$ 828,595
Total impairment, beginning of period						(47,432)
Beginning Balance		$ 913,261		$ 781,163
Goodwill from acquisitions		511	[1]	142,287	[2]
Foreign currency translation adjustments		(4,081)		(10,189)
Ending Balance		909,691		913,261
Americas Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year						523,914
Total impairment, beginning of period						(47,432)
Beginning Balance		477,141		476,482
Goodwill from acquisitions	[2]			2,462
Foreign currency translation adjustments		256		(1,803)
Ending Balance		477,397		477,141
EMEA Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year						240,303
Beginning Balance		376,827		240,303
Goodwill from acquisitions		511	[1]	139,825	[2]
Foreign currency translation adjustments		(3,208)		(3,301)
Ending Balance		374,130		376,827
Asia/Pacific Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year						$ 64,378
Beginning Balance		59,293		64,378
Foreign currency translation adjustments		(1,129)		(5,085)
Ending Balance		$ 58,164		$ 59,293

[1] Goodwill from acquisitions relates to the adjustments to goodwill related to the acquisition of PAY.ON, as discussed in Note 2.

[2] Goodwill from acquisitions relates to the goodwill recorded for the acquisition of PAY.ON, as well as adjustments to goodwill related to the acquisition of ReD, as discussed in Note 2, Acquisitions.