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Long-Term Debt - Additional Information (Detail)		9 Months Ended
	Aug. 20, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares		$ 101.38
Convertible Note Due 2023 | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 316,300,000.0
Interest rate (as a percent)	2.00%
Debt conversion ratio (in shares)	9.8643
Conversion price (in dollars per share) | $ / shares	$ 101.38
Debt issuance costs	$ 8,200,000
Convertible Notes 2023 Conversion Feature | Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	$ 7,000,000
6.0% senior notes due 2022 | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 300,000,000
Interest rate (as a percent)		6.00%
Credit facility | Line of Credit
Debt Instrument [Line Items]
Borrowing limit used		$ 1,000,000
Debt Instrument, Redemption, Period One | Convertible Note Due 2023 | Senior Notes
Debt Instrument [Line Items]
Redemption price (as a percent)		130.00%
Debt Instrument, Redemption, Period Two | Convertible Note Due 2023 | Senior Notes
Debt Instrument [Line Items]
Redemption price (as a percent)		98.00%

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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

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

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