Senior Secured Notes - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended		1 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jul. 11, 2012	Jul. 31, 2012 12% Senior Secured Notes Due July 2017 [Member]	Jul. 11, 2012 12% Senior Secured Notes Due July 2017 [Member]	Jul. 31, 2012 Convertible Subordinated Notes [Member]	Dec. 31, 2013 12% Senior Secured Notes Due July 2017 [Member]	Dec. 31, 2013 Jul 1, 2015 through June 30, 2017 [Member]
Line of Credit Facility [Line Items]
Senior secured notes, issued	$ 125,000,000	$ 125,000,000			$ 125,000,000
Maturity date of senior secured notes				Jul. 15, 2017			Jul. 15, 2017
Retirement of convertible subordinated notes						42,500,000
Interest rate	12.00%				12.00%		12.00%
Issuance costs				4,500,000
Convertible subordinated notes remaining			172,400,000
Maturity date of convertible subordinated notes	Sep. 28, 2012
Restricted Cash	25,000,000	25,000,000	25,000,000
Minimum Cash Requirement (Jul 1, 2015 through June 30, 2017)								25,000,000
Percentage of repurchase of notes on principal amount of notes	101.00%
Percentage of repurchase of notes on principal amount of notes	100.00%
Senior Secured Notes carrying amount							$ 125,000,000