Long-Term Debt Obligations - 2024 Notes, Bond Hedges and Warrant Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
May 31, 2019 USD ($) d $ / shares shares	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Proceeds from issuances of warrants		$ 174,432
Senior Notes [Member] \| 2.00% Convertible Senior Notes due in 2024 [Member]
Debt Instrument [Line Items]
Principal amount of convertible senior notes	$ 1,840,000
Interest Rate	2.00%
Contractual Maturity Date	2024-05
Proceeds from convertible senior notes, net of underwriting discounts and issuance costs	$ 1,820
Shares issued upon conversion of each $1000 principal amount \| shares	3.2276
Convertible notes, conversion price \| $ / shares	$ 309.83
Debt instrument convertible, percentage of conversion price	130.00%
Product percentage of closing sale price of common stock	98.00%
Percentage of repurchase price is equal to principal amount of convertible notes	100.00%
Debt conversion, converted instrument, amount	$ 490,900
Debt instrument, effective interest rate	8.68%
Payment for purchase of common stock \| shares	5,900,000
Conversion price per share \| $ / shares	$ 309.83
Hedge transactions	$ 475,800
Shares issued under warrants \| shares	5,900,000
Exercise price of warrant \| $ / shares	$ 607.50
Proceeds from issuances of warrants	$ 174,400
Senior Notes [Member] \| 2.00% Convertible Senior Notes due in 2024 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Conversion price per share \| $ / shares	$ 309.83
Senior Notes [Member] \| 2.00% Convertible Senior Notes due in 2024 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Conversion price per share \| $ / shares	$ 607.50
Senior Notes [Member] \| 2.00% Convertible Senior Notes due in 2024 [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] \| 2.00% Convertible Senior Notes due in 2024 [Member] \| One Hundred Thirty Percent Applicable Conversion Price [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument convertible trading days \| d	30
Senior Notes [Member] \| 2.00% Convertible Senior Notes due in 2024 [Member] \| Ninety Eight Percent Applicable Conversion Price [Member]
Debt Instrument [Line Items]
Debt instrument convertible consecutive trading days \| d	5

Conversion price per share.

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Debt instrument contractual maturity month and year.

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Debt instrument convertible conversion price percentage.

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The number of shares we purchase under note hedge transactions entered.

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The cost of the convertible note hedge transactions.

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Percentage of principal amount of convertible notes is equal to repurchase price.

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Purchase price per common stock.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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