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