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Net Income per Share (Narrative) (Detail) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended							3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
Net Income per Share (Narrative) (Detail) (USD $)	Sep. 30, 2013 Warrants [Member]	Sep. 30, 2013 Warrants [Member]	Sep. 30, 2013 Purchased Call Options [Member]	Sep. 30, 2013 Purchased Call Options [Member]	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Aug. 01, 2013 February 2015 Notes [Member]	Mar. 31, 2012 February 2015 Notes [Member]	Jan. 31, 2012 February 2015 Notes [Member]	Feb. 07, 2014 Series 2012 Notes [Member]	Feb. 06, 2014 Series 2012 Notes [Member]	Feb. 29, 2012 Series 2012 Notes [Member]	Sep. 30, 2014 May 2015 Notes [Member] [Member] Warrants [Member]	Sep. 30, 2014 May 2015 Notes [Member] [Member] Warrants [Member]	Sep. 30, 2014 May 2015 Notes [Member] [Member] Purchased Call Options [Member]	Sep. 30, 2014 May 2015 Notes [Member] [Member] Purchased Call Options [Member]	Sep. 30, 2014 February 2018 Notes [Member]	Feb. 12, 2014 February 2018 Notes [Member]	Sep. 30, 2014 February 2018 Notes [Member] Warrants [Member]	Sep. 30, 2014 February 2018 Notes [Member] Warrants [Member]	Sep. 30, 2014 February 2018 Notes [Member] Purchased Call Options [Member]	Sep. 30, 2014 February 2018 Notes [Member] Purchased Call Options [Member]
Debt Instrument [Line Items]
Amount of convertible notes payable												$ 179,000,000
Convertible notes											$ 1,000,000		$ 169,000,000	$ 131,700,000	$ 131,700,000	$ 10,000,000					$ 274,512,000	$ 300,000,000
Antidilutive securities excluded from computation of earnings per share (in Shares)	20,800,000	20,800,000	24,400,000	24,400,000	4,000	121,000	47,000	133,000	10,000	0							22,200,000	22,200,000	26,100,000	26,100,000			29,000,000	29,000,000	32,700,000	32,700,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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