Purchase Price Allocation (Parenthetical) (Detail)	0 Months Ended
	Jun. 26, 2014	Jul. 17, 2014
ICRA | Trade names
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	36 years
ICRA | Client relationships
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	19 years
ICRA | Other intangibles
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	17 years
ICRA | Total Intangible Assets
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	26 years
Web Equity Solutions [Member] | Trade names
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		4 years
Web Equity Solutions [Member] | Client relationships
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		18 years
Web Equity Solutions [Member] | Software
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		15 years
Web Equity Solutions [Member] | Total Intangible Assets
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)		17 years