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Allowance for Doubtful Accounts - Summary of Allowance for Doubtful Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Allowance for Doubtful Accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period $ 8,657 $ 11,706
Charged to Expense 9,485 7,871
Deductions (9,050) (11,551)
Balance at End of Period $ 9,092 $ 8,026