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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail)
Jun. 30, 2013
USD ($)
Jun. 30, 2013
Norwegian Kroner [Member]
USD ($)
Jun. 30, 2013
Norwegian Kroner [Member]
NOK
Jun. 30, 2013
Euro [Member]
USD ($)
Jun. 30, 2013
Euro [Member]
EUR (€)
Jun. 30, 2013
Canadian Dollar [Member]
USD ($)
Jun. 30, 2013
Canadian Dollar [Member]
CAD
Jun. 30, 2013
British Pound [Member]
USD ($)
Jun. 30, 2013
British Pound [Member]
GBP (£)
Derivative [Line Items]                  
Contract Amount in Foreign Currency     1,039,400,000   € 2,000,000   10,500,000   £ 1,800,000
Average Forward Rate   5.97 5.97 0.75 0.75 1.03 1.03 0.63 0.63
Fair Value / Carrying Amount of Asset (Liability) Hedge Derivatives (200,000)           (100,000)   (100,000)  
Fair Value / Carrying Amount of Asset (Liability) Non-hedge Derivatives (4,500,000) (4,300,000)   (100,000)   (100,000)       
Expected Maturity Amount of Foreign Currency Derivatives in Current Year 121,900,000 106,100,000   2,700,000   10,200,000   2,900,000  
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year $ 68,100,000 $ 68,100,000