Quarterly report pursuant to sections 13 or 15(d)

Intangible Assets - Additional Information (Detail)

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Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Increase In Intangible Assets $ 4,489    
Unamortizable Intangible Assets, Impairment of intangibles     2,319
Amortization expense for continuing operations, in cost of revenues $ 311 $ 173