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Debt - Line of Credit (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2014
Sep. 30, 2016
Line of Credit Facility [Line Items]    
Line of Credit Facility, Available Additional Borrowing Capacity   $ 300.0
Payments of Financing Costs $ 2.2  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.125%
Maximum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.30%
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 500.0
Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 300.0
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Adjusted Base Rate [Member] | Federal Funds Rate [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   0.50%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Adjusted Base Rate [Member] | Eurodollar Rate [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   1.00%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Applicable Margin [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   0.125%
oii term loan facility spread on variable rate   0.00%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Applicable Margin [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   0.75%
oii term loan facility spread on variable rate   0.50%
Credit Agreement [Member] | Eurodollar Advances [Member] | Applicable Margin [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   1.125%
oii term loan facility spread on variable rate   1.00%
Credit Agreement [Member] | Eurodollar Advances [Member] | Applicable Margin [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Basis Spread on Variable Rate   1.75%
oii term loan facility spread on variable rate   1.50%