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Intangible Assets (Reconciliation of Intangible Assets) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Finite-Lived Intangible Assets [Line Items]            
Asset impairment write-down $ (14,800) $ 14,830 $ (14,830) $ (14,800)    
Amortization expense     (2,037)   (3,302) (3,289)
Net book value at end of year 4,596 4,596 4,226 4,596 21,564  
Patented technologies
            
Finite-Lived Intangible Assets [Line Items]            
Patented technologies Gross carrying amount at beginning of year   55,422 55,422   53,275  
Asset impairment write-down     (14,830)      
Foreign currency translation adjustments     (1,036)   2,147  
Gross carrying amount at end of year     39,556   55,422  
Accumulated amortization at beginning of year   (33,858) (33,858)   (29,398)  
Amortization expense     (2,037)   (3,302)  
Foreign currency translation adjustments     565   (1,158)  
Accumulated amortization at end of year     (35,330)   (33,858)  
Net book value at end of year     $ 4,226   $ 21,564