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Fair Value Measurements - Additional Information (Details) (Equity Securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets transferred from Level 2 to Level 1	$ 7,200us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember

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- Details

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X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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