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Long-term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011 Senior Secured Notes [Member]	Sep. 30, 2012 Senior Secured Notes [Member]	Jun. 30, 2011 Senior Secured Credit Note [Member]	Sep. 30, 2012 Senior Secured Credit Note [Member]	Jun. 30, 2011 Subordinated Note [Member]	Sep. 30, 2012 Subordinated Note [Member]
Debt Instrument [Line Items]
Proceeds from the private placement				$ 200,000,000
Interest rate				8.75%
Retirement of notes						22,400,000
Subordinated note repayment	0	100,000,000						100,000,000
Cost to issue the Notes			4,600,000
Unamortized debt issuance costs					344,000
Effective portion of the net loss							1,300,000
Term of payments of interest on notes	Semi-annually
Private placement date	Apr. 12, 2011
Issued a note						125,000,000
Term of Senior Secured Credit Note						7 years
Proceeds from issuance of Subordinated Note								$ 100,000,000

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