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Net Interest Expense - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Interest Expense [Abstract]    
Interest related to tax penalties $ 4.4exp_TaxSettlementsInterestOnPenaltiesReceived $ 4.4exp_TaxSettlementsInterestOnPenaltiesReceived