Net (Loss) Income Per Common Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	0 Months Ended	3 Months Ended			9 Months Ended	3 Months Ended					12 Months Ended
	Dec. 31, 2012	Mar. 31, 2012 Successor [Member]	Dec. 31, 2012 Successor [Member]	Sep. 30, 2012 Successor [Member]	Jun. 30, 2012 Successor [Member]	Dec. 31, 2012 Successor [Member]	Mar. 19, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Sep. 30, 2011 Predecessor [Member]	Jun. 30, 2011 Predecessor [Member]	Mar. 31, 2011 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Dec. 31, 2010 Predecessor [Member]
Numerator for basic and diluted net (loss) income per share:
Net (loss) income	$ (15,800)	$ 472	$ (9,951)	$ 5,299	$ (8,173)	$ (12,353)	$ (3,433)	$ (1,350)	$ (6,264)	$ (1,368)	$ (1,891)	$ (10,873)	$ 5,412
Less: Net (loss) income allocated to participating securities						(18)
Net (loss) income attributable to common shareholders						$ (12,335)	$ (3,433)					$ (10,873)	$ 5,412
Denominator for basic and diluted net (loss) income per share:
Weighted average share outstanding						200,298,083	1,000					1,000	1,000
Weighted average unvested restricted shares outstanding						(298,083)
Denominator for basic and diluted net (loss) income per share:						200,000,000	1,000					1,000	1,000
Basic and diluted net (loss) income per share attributable to common shareholders		$ 0.00	$ (0.05)	$ 0.03	$ (0.04)	$ (0.06)	$ (3,433.00)	$ (1,350.00)	$ (6,264.00)	$ (1,368.00)	$ (1,891.00)	$ (10,873.00)	$ 5,412.00