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Intangible Assets - Reconciliation of Intangible Assets (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2012
Dec. 31, 2012
Patented technologies
Jun. 30, 2012
Patented technologies
Finite-Lived Intangible Assets [Line Items]              
Gross carrying amount at beginning of period           $ 39,556,000 $ 55,422,000
Asset impairment write-down   (14,830,000)   (14,830,000)     (14,830,000)
Foreign currency translation adjustments           812,000 (1,036,000)
Gross carrying amount at end of period           40,368,000 39,556,000
Accumulated amortization at beginning of period           (35,330,000) (33,858,000)
Amortization expense (194,000) (819,000) (386,000) (1,652,000)   (386,000) (2,037,000)
Foreign currency translation adjustments           (769,000) 565,000
Accumulated amortization at end of period           (36,485,000) (35,330,000)
Net book value at end of period $ 3,883,000   $ 3,883,000   $ 4,226,000 $ 3,883,000 $ 4,226,000