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Fair Value Measurements - Additional Information (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value Disclosures [Abstract] |  |
Transfers between level 1 and level 2 | $ 0 us-gaap_FairValueEquityLevel1ToLevel2TransfersAmount | $ 0 us-gaap_FairValueEquityLevel1ToLevel2TransfersAmount

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- Definition Amount of transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 1 of the fair value hierarchy into level 2. + 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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