Goodwill and Intangible Assets - Schedule of Gross Carrying and Accumulated Amortization Amounts Related to Company's Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	$ 813,383	$ 810,500
Accumulated amortization	(474,276)	(462,860)
Net carrying value	339,107	347,640
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	361,199	361,199
Accumulated amortization	(172,464)	(166,923)
Net carrying value	188,735	194,276
Trademarks/Trade Names [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	223,382	223,382
Accumulated amortization	(107,975)	(105,077)
Net carrying value	115,407	118,305
Technology/Software [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	212,261	210,013
Accumulated amortization	(186,633)	(184,290)
Net carrying value	25,628	25,723
Proprietary Data [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	28,627	28,627
Accumulated amortization	(8,999)	(8,571)
Net carrying value	19,628	20,056
Covenant Not to Compete [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	1,225	1,225
Accumulated amortization	(1,131)	(1,089)
Net carrying value	94	136
Subtotal [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	826,694	824,446
Accumulated amortization	(477,202)	(465,950)
Net carrying value	349,492	358,496
Foreign Exchange Translation Adjustment [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying value	(13,311)	(13,946)
Accumulated amortization	2,926	3,090
Net carrying value	$ (10,385)	$ (10,856)