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Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) $ in Millions	Dec. 31, 2016 USD ($)
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 945.6
2012 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	494.2
2013 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 451.4

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- Definition

Estimated Fair Value Of Financial Instruments [Line Items]

+ References

No definition available.

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Convertible Security
-URI http://asc.fasb.org/extlink&oid=6509036

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