SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
	Jun. 30, 2012
Significant Accounting Policies [Line Items]
Amortization period of drydock costs	60 months
Interest rate swap contracts [Member]
Significant Accounting Policies [Line Items]
Number of interest rate swap contracts	2
Vehicles [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Furniture and equipment [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Computer equipment [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	45.00%
Communication equipment [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Trademarks and trade names [Member]
Significant Accounting Policies [Line Items]
Amortization period	10 years
Customer relationships and contracts [Member]
Significant Accounting Policies [Line Items]
Amortization period	15 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Age of receivables	30 days
Minimum [Member] | Vessels [Member]
Significant Accounting Policies [Line Items]
Useful life	5 years
Minimum [Member] | Leasehold improvements [Member]
Significant Accounting Policies [Line Items]
Useful life	7 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Age of receivables	60 days
Freight surcharges as a percent of revenue	5.00%
Maximum [Member] | Vessels [Member]
Significant Accounting Policies [Line Items]
Useful life	25 years
Maximum [Member] | Leasehold improvements [Member]
Significant Accounting Policies [Line Items]
Useful life	11 years