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Net Income per Share (Narrative) (Detail) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Warrants [Member]
Jun. 30, 2013
Warrants [Member]
Jun. 30, 2013
Purchased Call Options [Member]
Jun. 30, 2013
Purchased Call Options [Member]
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 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]
Jun. 30, 2014
May 2015 Notes [Member] [Member]
Warrants [Member]
Jun. 30, 2014
May 2015 Notes [Member] [Member]
Warrants [Member]
Jun. 30, 2014
May 2015 Notes [Member] [Member]
Purchased Call Options [Member]
Jun. 30, 2014
May 2015 Notes [Member] [Member]
Purchased Call Options [Member]
Jun. 30, 2014
February 2018 Notes [Member]
Feb. 12, 2014
February 2018 Notes [Member]
Jun. 30, 2014
February 2018 Notes [Member]
Warrants [Member]
Jun. 30, 2014
February 2018 Notes [Member]
Warrants [Member]
Jun. 30, 2014
February 2018 Notes [Member]
Purchased Call Options [Member]
Jun. 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         $ 272,824,000 $ 300,000,000        
Antidilutive securities excluded from computation of earnings per share (in Shares) 20,400,000 20,400,000 24,000,000 24,000,000 24,000 139,000 69,000 139,000 28,000 8,000             21,800,000 21,800,000 25,700,000 25,700,000     29,000,000 29,000,000 32,700,000 32,700,000