DISCONTINUED OPERATIONS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets to be disposed of		$ 3,900,000
Assets of discontinued operations	0		23,813,000
Pretax income (loss)	1,882,000	(11,202,000)
Provision (benefit) for taxes on income	(2,141,000)	11,495,000
Discontinued operations, net of tax		(22,697,000)
Discontinued operations, net of tax	4,023,000
Rowan Land Rig [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of discontinued operations		26,900,000
Manufacturing [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss)	1,882,000	(7,599,000)
Provision (benefit) for taxes on income	(2,141,000)	15,751,000
Discontinued operations, net of tax		(23,350,000)
Discontinued operations, net of tax	4,023,000
Drilling [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss)	0	(3,603,000)
Provision (benefit) for taxes on income	0	(4,256,000)
Discontinued operations, net of tax		653,000
Discontinued operations, net of tax	0
Rowan Land Rig [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of discontinued operations	24,200,000
Net carrying value of discontinued operations	4,100,000
Liabilities of discontinued operations		20,100,000
Cash received from sale	6,000,000
Gain on sale of discontinued operations, net of tax	$ 4,000,000