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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Accrued interest on uncertain tax position	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Accrued penalties on uncertain tax position	$ 0.0	0.0	$ 0.0	$ 0.0
Percentage of penalties and related interest assessed to date	40.00%
Impact from settlement agreement	$ 17.0	17.0
Interest related to tax penalties	$ 4.4	$ 4.4

X

- Definition

Percentage of penalties and related interest assessed to date.

+ References

No definition available.

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- Definition

Tax settlements, interest on penalties received.

+ References

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- Definition

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (3)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

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- Definition

Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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- Definition

Amount of interest expense accrued for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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