Debt Term Loan (Details) - Credit Agreement [Member] - USD ($) $ in Millions	Dec. 31, 2016	Oct. 27, 2014
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 300
Applicable Margin [Member] | Minimum [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] | Minimum [Member] | Eurodollar Advances [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	1.125%
oii term loan facility spread on variable rate	1.00%
Applicable Margin [Member] | Maximum [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%
Applicable Margin [Member] | Maximum [Member] | Eurodollar Advances [Member]
Debt Instrument [Line Items]
oii term loan facility spread on variable rate	1.50%