Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	7 Months Ended		12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012	Dec. 31, 2011	May 31, 2010
Debt Instrument [Line Items]
Interest expense	$ 7,796		$ 11,121	$ 13,546	$ 1,481
Debt cost amortization	1,891		5,066	5,264	512
Write off of unamortized deferred debt issuance costs	0		0	1,940	0
Total interest expense	$ 9,687	$ 1,302	$ 16,187	$ 20,750	$ 1,993