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Selected Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 324,762 us-gaap_Revenues |  | $ 387,554 us-gaap_Revenues |  | $ 397,524 us-gaap_Revenues |  | $ 385,677 us-gaap_Revenues |  | $ 367,833 us-gaap_Revenues |  | $ 365,248 us-gaap_Revenues |  | $ 367,937 us-gaap_Revenues |  | $ 334,085 us-gaap_Revenues |  | $ 1,495,517 us-gaap_Revenues | $ 1,435,103 us-gaap_Revenues | $ 1,244,165 us-gaap_Revenues
Operating income (loss) | 25,672 us-gaap_OperatingIncomeLoss | [1] | (213,580)us-gaap_OperatingIncomeLoss | [1] | 84,723 us-gaap_OperatingIncomeLoss | [1] | 66,004 us-gaap_OperatingIncomeLoss | [1] | 61,063 us-gaap_OperatingIncomeLoss | [1] | 20,488 us-gaap_OperatingIncomeLoss | [1] | 76,565 us-gaap_OperatingIncomeLoss | [1] | 43,425 us-gaap_OperatingIncomeLoss | [1] | (37,181)us-gaap_OperatingIncomeLoss | 201,541 us-gaap_OperatingIncomeLoss | 206,232 us-gaap_OperatingIncomeLoss
Net earnings attributable to Tidewater Inc. | $ (9,076)us-gaap_NetIncomeLoss |  | $ (160,694)us-gaap_NetIncomeLoss |  | $ 60,907 us-gaap_NetIncomeLoss |  | $ 43,673 us-gaap_NetIncomeLoss |  | $ 43,417 us-gaap_NetIncomeLoss |  | $ 12,583 us-gaap_NetIncomeLoss |  | $ 54,172 us-gaap_NetIncomeLoss |  | $ 30,083 us-gaap_NetIncomeLoss |  | $ (65,190)us-gaap_NetIncomeLoss | $ 140,255 us-gaap_NetIncomeLoss | $ 150,750 us-gaap_NetIncomeLoss
Basic earnings per share attributable to Tidewater Inc. | $ (0.19)us-gaap_EarningsPerShareBasic |  | $ (3.31)us-gaap_EarningsPerShareBasic |  | $ 1.23 us-gaap_EarningsPerShareBasic |  | $ 0.88 us-gaap_EarningsPerShareBasic |  | $ 0.88 us-gaap_EarningsPerShareBasic |  | $ 0.25 us-gaap_EarningsPerShareBasic |  | $ 1.10 us-gaap_EarningsPerShareBasic |  | $ 0.61 us-gaap_EarningsPerShareBasic |  | $ (1.34)us-gaap_EarningsPerShareBasic | $ 2.84 us-gaap_EarningsPerShareBasic | $ 3.04 us-gaap_EarningsPerShareBasic
Diluted earnings per share attributable to Tidewater Inc. | $ (0.19)us-gaap_EarningsPerShareDiluted |  | $ (3.31)us-gaap_EarningsPerShareDiluted |  | $ 1.22 us-gaap_EarningsPerShareDiluted |  | $ 0.88 us-gaap_EarningsPerShareDiluted |  | $ 0.88 us-gaap_EarningsPerShareDiluted |  | $ 0.25 us-gaap_EarningsPerShareDiluted |  | $ 1.09 us-gaap_EarningsPerShareDiluted |  | $ 0.61 us-gaap_EarningsPerShareDiluted |  | $ (1.34)us-gaap_EarningsPerShareDiluted | $ 2.82 us-gaap_EarningsPerShareDiluted | $ 3.03 us-gaap_EarningsPerShareDiluted
[1] | Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, general and administrative expenses and gain on asset dispositions, net, of the company's operations. Goodwill impairment by quarter for fiscal 2015 and 2014 and gain on asset dispositions, net, by quarter for fiscal 2015 and 2014, are as follows:

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