Fair Value, Valuation Techniques and Related Unobservable Inputs (Detail) (U.S. Print and Related Services, USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012 Presort, Meisel, XPO and Edgar Online Acquisitions	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Fair Value, Inputs, Level 3 Contingent Consideration Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Customer Relationships Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Customer Relationships Minimum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Customer Relationships Maximum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Technology Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Technology Minimum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Technology Maximum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Trade Names Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Trade Names Minimum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Trade Names Maximum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Noncompete Agreements Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Noncompete Agreements Minimum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring	Sep. 30, 2013 Presort, Meisel, XPO and Edgar Online Acquisitions Noncompete Agreements Maximum Fair Value, Inputs, Level 3 Fair Value, Measurements, Nonrecurring
Acquired Finite Lived Intangible Assets [Line Items]
Contingent consideration	$ 2.9	$ 3.5	$ 3.5
Fair Value				$ 31.4			$ 14.5			$ 3.5			$ 2.6
Valuation Technique			Probability weighted discounted future cash flows	Excess earnings, with and without method			Excess earnings, relief-from-royalty method, cost approach			Relief-from-royalty method			Excess earnings, with and without method
Royalty rate (after-tax)							4.50%				0.30%	1.20%
Discount rate			4.50%		16.00%	17.00%		16.00%	17.00%		15.50%	17.00%		16.00%	17.00%
Attrition rate					7.00%	20.00%
Obsolescence factor								10.00%	20.00%