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Stock-Based Compensation - Remaining Fair Value of Stock Options (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Remaining Fair Value Of Stock Options [Abstract]
Fair value of stock options	$ 4,210us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

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- Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
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