Recognized Interest and Penalties Related to Uncertain Tax Positions (Detail) (USD $) In Thousands, unless otherwise specified	7 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	May 31, 2010
Income Tax Uncertainties [Line Items]
Interest and penalties included in provision for income taxes	$ 473	$ (2,539)	$ 1,174	$ 0