Debt Term Loan (Details) (Credit Agreement [Member], USD $) In Millions, unless otherwise specified	Oct. 27, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
Applicable Margin [Member] | Minimum [Member] | Subsequent Event [Member] | Adjusted Base Rate Advances [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate		0.125%
oii term loan facility spread on variable rate		0.00%
Applicable Margin [Member] | Maximum [Member] | Subsequent Event [Member] | Adjusted Base Rate Advances [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate		0.75%
oii term loan facility spread on variable rate		0.50%