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Convertible and Long-Term Debt Obligations - 2.375% Convertible Senior Notes due in 2022, Bond Hedges and Warrant Transactions - Additional Information (Detail)
1 Months Ended 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
d
$ / shares
shares
Debt Instrument [Line Items]    
Proceeds from issuance of warrants   $ 52,883,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt conversion, converted instrument, amount   $ 145,600,000
Debt instrument, effective interest rate 6.00% 6.00%
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member]    
Debt Instrument [Line Items]    
Principal amount of convertible senior notes $ 977,500,000 $ 977,500,000
Interest Rate 2.375% 2.375%
Debt instrument maturity date Mar. 31, 2022  
Proceeds from convertible senior notes, net of underwriting discounts and issuance costs $ 965,900,000  
Convertible principal amount   $ 1,000
Convertible instrument, shares issued | shares   3.0534
Convertible notes, conversion price | $ / shares $ 327.50 $ 327.50
Debt instrument convertible, percentage of conversion price 130.00% 130.00%
Average percentage of closing sale price of common stock   98.00%
Percentage of repurchase price is equal to principal amount of convertible notes   100.00%
Payment for purchase of common stock | shares 3,000,000 3,000,000
Common stock purchase price | $ / shares $ 327.50 $ 327.50
Hedge transactions   $ 204,100,000
Shares issued under warrants | shares 3,000,000 3,000,000
Exercise price of warrant | $ / shares $ 655.00 $ 655.00
Proceeds from issuance of warrants   $ 52,900,000
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member] | Minimum [Member] | Warrant [Member]    
Debt Instrument [Line Items]    
Conversion price per share | $ / shares 327.50 $ 327.50
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member] | Maximum [Member] | Warrant [Member]    
Debt Instrument [Line Items]    
Conversion price per share | $ / shares $ 655.00 $ 655.00
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member] | One Hundred Thirty Percent Applicable Conversion Price [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instrument convertible consecutive trading days | d   20
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member] | One Hundred Thirty Percent Applicable Conversion Price [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument convertible trading days   30 days
Senior Notes [Member] | 2.375% Convertible Senior Notes due in 2022 [Member] | Ninety Eight Percent Applicable Conversion Price    
Debt Instrument [Line Items]    
Debt instrument convertible consecutive trading days | d   5