Purchase Price Allocation (Parenthetical) (Detail)	Aug. 10, 2017	Mar. 01, 2016
Gilliland Gold Young (GGY) [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		14 years
Gilliland Gold Young (GGY) [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		19 years
Gilliland Gold Young (GGY) [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		21 years
Gilliland Gold Young (GGY) [Member] | Software [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		7 years
Bureau van Dijk (BvD) [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	21 years
Bureau van Dijk (BvD) [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	18 years
Bureau van Dijk (BvD) [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	23 years
Bureau van Dijk (BvD) [Member] | Product Technology [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	12 years
Bureau van Dijk (BvD) [Member] | Database [Member]
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	10 years