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Net Income (Loss) Per Common Share - Calculation of Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Earnings Per Share [Abstract] |  |  |
Dilutive effects from equity instruments | 0 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements | 0 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements | 0 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements

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- Definition Additional shared included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward arrangements using the reverse treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2366-109256 + Details
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