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Summary of Debt Outstanding (Detail)
NOK in Thousands, $ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2016
NOK
Mar. 31, 2016
USD ($)
Mar. 31, 2016
NOK
Debt [Line Items]        
Amount outstanding $ 2,043,001   $ 2,052,270  
Less: Deferred debt issue costs 6,941   6,754  
Total debt 2,036,060   2,045,516  
Revolving Line of Credit        
Debt [Line Items]        
Outstanding borrowing [1],[2] 600,000   600,000  
Term loan        
Debt [Line Items]        
Amount outstanding [1] 300,000   300,000  
September 2013 Senior Unsecured Notes        
Debt [Line Items]        
Aggregate debt outstanding 500,000   500,000  
August 2011 Senior Unsecured Notes        
Debt [Line Items]        
Aggregate debt outstanding 165,000   165,000  
September 2010 Senior Unsecured Notes        
Debt [Line Items]        
Aggregate debt outstanding 382,500   382,500  
May 2015 4.22% Notes        
Debt [Line Items]        
Amount outstanding [3] 27,421   30,033  
March 2015 4.21% Notes        
Debt [Line Items]        
Amount outstanding [3] 25,802   27,030  
January 2014 3.81% notes        
Debt [Line Items]        
Amount outstanding [3] 27,487 NOK 237,500 30,207 NOK 250,000
May 2012 5.38% notes        
Debt [Line Items]        
Amount outstanding [3] $ 14,791 NOK 127,800 $ 17,500 NOK 144,840
[1] The fair value of the term loan and the revolving line of credit approximated their carrying values at March 31, 2016.
[2] The revolver was fully utilized at December 31, 2016 and March 31, 2016, respectively.
[3] Troms Offshore debt requires semi-annual principal payments and has a 12 year maturity.