Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended		12 Months Ended			1 Months Ended					1 Months Ended			1 Months Ended
	Feb. 02, 2013	Feb. 28, 2012	Feb. 28, 2012 Apollo Global Securities, LLC	Sep. 20, 2012 Senior secured first lien notes	Feb. 02, 2013 Senior secured first lien notes	Feb. 02, 2013 Senior Fixed Rate Notes	Feb. 02, 2013 Senior Toggle Notes	Apr. 01, 2013 Subsequent Event	Mar. 15, 2013 Subsequent Event	Mar. 28, 2013 Subsequent Event	Mar. 15, 2013 Subsequent Event Period One	Mar. 15, 2013 Subsequent Event Period Two	Mar. 15, 2013 Subsequent Event Apollo Global Securities, LLC	Apr. 01, 2013 Subsequent Event Senior Fixed Rate Notes and Senior Toggle Notes	Mar. 01, 2013 Subsequent Event Senior Fixed Rate Notes and Senior Toggle Notes	Mar. 15, 2013 Subsequent Event Senior secured first lien notes	Mar. 14, 2013 Subsequent Event Senior Fixed Rate Notes	Mar. 14, 2013 Subsequent Event Senior Toggle Notes
Subsequent Event [Line Items]
Tender offer to repurchase aggregate principal amount notes														$ 149,500,000	$ 210,000,000
Percentage senior secured first lien notes		9.00%				9.25%										6.125%
Senior notes principal amount		400,000,000			1,142,100,000	250,000,000	350,000,000									210,000,000
Senior notes, maturity date					Mar. 15, 2019	Jun. 01, 2015	Jun. 01, 2015									Mar. 15, 2020
Percentage of issue amount to face amount	100.00%			102.50%	101.50%											100.00%
Aggregate principal amount										20,000							39,000,000	21,500,000
Semi annual interest payment day and month											--03-01	--09-01
Percentage of voting interest	65.00%								65.00%
Percentage of non voting interest	100.00%								100.00%
Repurchase of senior notes								20,000	63,300,000
Fees for issuance of Senior Secured First Lien Notes			$ 700,000										$ 200,000