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Financial Instruments and Fair Value Measurement - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Jun. 30, 2011
Debt Instrument [Line Items]    
Carrying value of long-term debt, excluding leases $ 1,737,467 $ 1,765,892
Fair value of long-term debt, excluding leases $ 1,981,380 $ 1,902,221