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Debt - Convertible Senior Notes - Additional Information (Detail) (USD $)
6 Months Ended 0 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 15, 2013
Senior Convertible Notes
Mar. 15, 2013
Senior Convertible Notes
Mar. 15, 2013
Scenario 1
D
Mar. 15, 2013
Scenario 2
Debt Instrument [Line Items]              
Issuance Date       Mar. 15, 2013      
Debt Instrument, Maturity Date Apr. 01, 2019     Apr. 01, 2019      
Date of First Required Payment       Oct. 01, 2013      
Net of Issuance Costs       $ 194,800,000      
Convertible, Earliest Date       Jul. 01, 2013      
Convertible, Trading Days           20  
Convertible, Threshold Consecutive Trading Days           30 days 5 days
Threshold Percentage of Stock Price Trigger           130.00% 98.00%
Convertible, Latest Date       Mar. 28, 2019      
Conversion Ratio       0.0461723      
Conversion Price         $ 21.66    
Convertible Threshold Trading Days Weighted Average Price       25 days      
Redemption Period, Start Date       Apr. 06, 2016      
Redemption Price, Percentage of Principal Amount Redeemed       100.00%      
Convertible Effective Interest Rate       6.50%      
Convertible, Carrying Amount of Equity Component         22,300,000    
Debt issuance costs   6,432,000   6,400,000      
Debt Issuance Costs Liability Component       5,700,000      
Debt Instrument, Convertible, Remaining Discount Amortization Period       6 years      
Debt Instrument, Face Amount 266,634,000   322,634,000   201,250,000.00    
Debt Instrument Additional Issued Principal Amount         $ 26,250,000.00    
Debt Instrument, Interest Rate, Stated Percentage         4.25%    
Debt Instrument, Frequency of Periodic Payment       semi-annually