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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  | $ 2,703 | $ 1,927 | $ 2,123
Interest and other debt costs |  |  |  |  |  |  |  |  | 53,752 | 50,029 | 43,814
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | (139,557) | (66,426) | 173,048
Tax effect |  |  |  |  |  |  |  |  | 20,819 | (1,077) | 32,793
Net earnings (loss) attributable to Tidewater Inc. | $ (81,787) | $ (19,509) | $ (43,835) | $ (15,052) | $ (9,076) | $ (160,694) | $ 60,907 | $ 43,673 | (160,183) | (65,190) | $ 140,255
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before income taxes |  |  |  |  |  |  |  |  | 420 | 924 |
Tax effect |  |  |  |  |  |  |  |  | 147 |  |
Net earnings (loss) attributable to Tidewater Inc. |  |  |  |  |  |  |  |  | 273 | 924 |
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  | 200 | 207 |
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and other debt costs |  |  |  |  |  |  |  |  | $ 220 | $ 717 |

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