Convertible Notes (Narrative) (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended			0 Months Ended	1 Months Ended	3 Months Ended								0 Months Ended	3 Months Ended			3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended			0 Months Ended	3 Months Ended		0 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2014	Feb. 06, 2014	May 16, 2011	Feb. 05, 2014 Series 2012 Notes [Member]	Jan. 31, 2012 Series 2012 Notes [Member]	Mar. 31, 2014 Series 2012 Notes [Member]	Jun. 30, 2013 Series 2012 Notes [Member]	Feb. 12, 2014 Series 2012 Notes [Member]	Feb. 07, 2014 Series 2012 Notes [Member]	Feb. 06, 2014 Series 2012 Notes [Member]	Dec. 31, 2013 Series 2012 Notes [Member]	Aug. 01, 2013 Series 2012 Notes [Member]	Feb. 29, 2012 Series 2012 Notes [Member]	May 16, 2011 May 2015 Notes [Member]	Mar. 31, 2014 May 2015 Notes [Member]	Jun. 30, 2013 May 2015 Notes [Member]	Dec. 31, 2013 May 2015 Notes [Member]	Mar. 31, 2014 Purchased Call Options [Member]	Jan. 31, 2013 Warrants [Member]	Mar. 31, 2014 Warrants [Member]	Jan. 31, 2012 February 2015 Notes [Member]	Mar. 31, 2014 February 2015 Notes [Member]	Aug. 01, 2013 February 2015 Notes [Member]	Feb. 11, 2014 February 2018 Notes [Member]	Mar. 31, 2014 February 2018 Notes [Member]	Feb. 12, 2014 February 2018 Notes [Member]	Feb. 11, 2014 February 2018 Note Purchase Call Option [Member]	Mar. 31, 2014 February 2018 Note Purchase Call Option [Member]	Feb. 05, 2014 February 2018 Note Warrant [Member]	Mar. 31, 2014 February 2018 Note Warrant [Member]	Mar. 31, 2014 Term Loan. [Member]	Oct. 28, 2013 Term Loan. [Member]	Mar. 31, 2014 Term Loan. [Member] Base Rate [Member]	Oct. 28, 2013 Term Loan. [Member] Base Rate [Member]
Debt Instrument [Line Items]
Convertible notes											$ 131,700,000	$ 131,700,000			$ 10,000,000	$ 155,300,000							$ 169,000,000		$ 1,000,000		$ 270,944,000	$ 300,000,000
Total consideration given for convertible note exchange												191,800,000
Incentive fee per each $1,000 principal amount tendered to convert debt																							5.00
Principal amount a $5 incentive cash payment per each to convert debt	1,000						1,000	1,000															1,000
Induced conversion of convertible debt expense							845,000
Deferred issue costs, incentive payment allocated							765,000
Adjustments to additional paid in capital, equity component of convertible debt							52,000	10,900,000									12,300,000
Noted obligation allocated to deferred tax assets							28,000	5,900,000									6,600,000
Debt instrument, interest rate (in Percent)							2.875%										3.75%											4.00%							2.24%	1.00%
Convertible note rate conversion trading days (in days)	0
Convertible Notes rate conversion consecutive trading days (in days)	30
Convertible notes due upon demand within (in years)			1
Total debt discount																	18,900,000							16,800,000
Unamortized discount of liability component							(2,300,000)	(1,550,000)		(2,100,000)			(7,370,000)				(5,736,000)		(6,997,000)								(29,056,000)	(29,700,000)
Debt discount recorded to additional paid in capital																												19,300,000
Debt discount recorded to deferred tax liability																												10,400,000
Minimum conversion price percent for note conversion (in Percent)							130.00%										130.00%
Convertible Notes rate conversion business day period (in days)	5
Convertible Notes rate conversion consecutive trading day period (in days)	0
Maximum percent of common stock closing price and conversion rate to convert note (in Percent)							98.00%										98.00%
Debt Instrument, Interest Rate, Effective Percentage					7.50%		7.30%	7.30%								7.50%												6.90%
Convertible notes, conversion price (in Dollars per Share)								$ 5.38									$ 6.15					$ 7.23						$ 9.17				$ 10.3610
Estimated market interest rate for similar nonconvertible instrument																												7.00%
Debt instrument, convertible, remaining amortization period (in Duration)								10 months 21 days									1 year 1 month 1 day										46 months
Debt instrument, convertible, conversion threshold (in Dollars per Share)								$ 7.00	$ 7.12								$ 7.99	$ 8.13
Debt instrument, convertible, if-converted value								26,300,000									54,700,000										28,000,000
Net proceeds from the issuance of convertible notes	300,000,000	0														149,700,000										290,200,000
Convertible notes repurchase price as a percentage of principal (in Percent)																100.00%
Debt Instrument, Face Amount								48,311,000				48,300,000	180,000,000	180,000,000			155,250,000		155,250,000					0			300,000,000	300,000,000					56,250,000
Conversion Rate per $1,000 Principal Amount (in Ratio)								185.7770									162.7280									109.1048
Number of hedge counterparties (in Counterparties)																														2
Purchased call options cost																				20,800,000									31,000,000
Number of shares of common stock covered by the purchased call options purchased (in Shares)																				25.3		27.5								32.7
Proceeds from Issuance of Warrants	11,427,000	0																			10,900,000	10,900,000									11,400,000
Debt conversion, shares issued (in Shares)						20.3																2.0
Debt Conversion, Converted Instrument, Amount						157,600,000
Cash paid to exchange convertible note												34,200,000
Inducement fee												2,500,000
Interest Payable												1,800,000
Deferred Income Tax Expense (Benefit)						29,900,000
Deferred taxes included in purchased call options cost																				7,200,000									10,800,000
Gain on conversion of convertible notes	6,143,000	0
Debt discount, derecognition on exchange												5,800,000
Debt Exchange cost other												300,000
Share Price				$ 7.97
Dividends Payable, Amount Per Share	$ 0.15
Short-term Debt																																		$ 75,000,000