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Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Payables And Accruals [Abstract]    
Balance at beginning of period $ 2,709 $ 5,896
Accruals for warranties during the period 152 (167)
Settlements during the period (74) (229)
Balance at end of period $ 2,787 $ 5,500