Estimated Fair Value and Weighted Average Useful Lives of Identifiable Intangible Assets Acquired (Detail) (Term Net, USD $) In Thousands, unless otherwise specified	1 Months Ended
	May 02, 2011 Year Entity
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 11,640
Acquired intangible assets, Weighted Average Useful Lives	7.3
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	9,900
Acquired intangible assets, Weighted Average Useful Lives	7
Channel Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	1,600
Acquired intangible assets, Weighted Average Useful Lives	10
Noncompete Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 100
Acquired intangible assets, Weighted Average Useful Lives	2