Transactions with Sponsors - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Mar. 07, 2011	Jul. 28, 2012
Related Party Transaction [Line Items]
Aggregate transaction fee received by Sponsors	$ 35
Sponsor Fees, Description		In addition, pursuant to such agreement, and in exchange for on-going consulting and management advisory services, the Sponsors receive an aggregate annual monitoring fee prepaid quarterly equal to the greater of (i) 40 basis points of consolidated annual revenues or (ii) $8 million. The Sponsors also receive reimbursement for out-of-pocket expenses incurred in connection with services provided pursuant to the agreement.
Monitoring fees, included in selling, general and administrative expenses		$ 4.5