Investments and Fair Value Measurements - Additional Information1 (Detail) - Convertible Senior Notes Due 2019 [Member] - USD ($) $ in Millions	1 Months Ended
Sep. 30, 2014	Sep. 30, 2015
Investments And Fair Value Measurements [Line Items]
Aggregate principal amount of debt issued	$ 345
Interest rate of debt issued	0.75%
Maturity year of debt	2019
Fair value of notes issued		$ 350

Investments and fair value measurements.

No definition available.

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- Definition

Year the original debt was scheduled to mature, in CCYY format.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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- Definition

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

+ References

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-Publisher FASB

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Subparagraph (a)

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- Definition

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

+ References

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-Topic 210

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