Pro Forma Financial Information Based on Assumption that Cmp Acquisition and Citadel Acquisition Occurred as of January Two Thousand Ten (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition, Pro Forma Information [Line Items]
Net revenue	$ 284,196	$ 275,350	$ 281,041	$ 235,995	$ 281,265	[1]	$ 124,790	[1]	$ 62,241	[1]	$ 51,667	[1]	$ 1,076,582	$ 519,963	$ 236,640
Net loss	(84,791)	56,045	8,143	(12,126)	(13,138)	[1]	59,538	[1]	1,341	[1]	16,119	[1]	(32,729)	63,860	29,402
CMP Acquisition | Pro Forma
Business Acquisition, Pro Forma Information [Line Items]
Net revenue													1,082,877	1,111,553
Net loss													$ (71,011)	$ (32,488)

[1] The fair value of the Green Bay Option was determined using inputs that are supported by little or no market activity (a Level 3 measurement). The fair value represents an estimate of the net amount that the Company would pay if the option was transferred to another party as of the date of the valuation. The option valuation incorporates a credit risk adjustment to reflect the probability of default by the Company.