Long-Term Debt and Revolving Line of Credit - Summary of Interest Rates for Revolving Loan and Term Loan (Detail)	0 Months Ended	2 Months Ended		3 Months Ended	9 Months Ended
	Jul. 28, 2011	Sep. 30, 2011	Jul. 15, 2011	Dec. 31, 2011	Sep. 30, 2012
Debt [Line Items]
Term Loan	15.82%	13.57%	14.82%	13.82%	14.07%
Revolver	14.25%	11.625%	13.25%	11.875%	12.125%