Fair Value, Valuation Techniques and Related Unobservable Inputs for Level Three (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount		$ 37.5
Customer Relationships
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount		31.4
Fair Value, Inputs, Level 3 | Customer Relationships
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amount		$ 3.1
Valuation Technique	With and without method	Excess earnings
Discount rate	16.00%
Fair Value, Inputs, Level 3 | Customer Relationships | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate		12.50%
Attrition rate		2.00%
Fair Value, Inputs, Level 3 | Customer Relationships | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate		15.00%
Attrition rate		15.90%