| Contingent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | 
|---|---|
| Contingent Liabilities | |
| Contingent liability, net of discount | $ 841 | 
| Contingent Liability for Acquisition | |
| Contingent Liabilities | |
| Contingent liability, net of discount | $ 841 | 
| X | ||||||||||
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- Definition Noncurrent portion of the fair value as of the acquisition date of potential payments under the contingent consideration arrangement, including cash and shares as applicable. No definition available. 
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| X | ||||||||||
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- Details 
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