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Acquisition (Narrative) (Detail) (USD $)
1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jul. 22, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 01, 2010
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2011
3dB [Member]
Feb. 10, 2011
3dB [Member]
Year
Sep. 13, 2010
Aha [Member]
Jun. 30, 2012
Customer Relationships [Member]
Jun. 30, 2012
Technology [Member]
Jun. 30, 2010
Trade Names [Member]
Jun. 30, 2010
Distribution Rights [Member]
Jun. 30, 2010
Distribution Rights [Member]
Minimum [Member]
Jun. 30, 2010
Distribution Rights [Member]
Maximum [Member]
Jun. 30, 2010
Noncompete Agreements [Member]
Jun. 30, 2010
Noncompete Agreements [Member]
Minimum [Member]
Jun. 30, 2010
Noncompete Agreements [Member]
Maximum [Member]
Jun. 30, 2012
Mwm Acoustics [Member]
Business Acquisition [Line Items]                                          
Acquisition price $ 80,000,000         $ 76,700,000       $ 3,000,000 $ 1,800,000                    
Number of days for working capital adjustment 60                                        
Accrued working capital adjustment amount 100,000                                        
Cash paid to acquire entity 72,000,000         65,100,000       2,300,000                      
Remainder of Fixed Purchase Price payable in future 8,000,000                                        
Acquisition earn-out contingent payable 57,000,000       1,600,000                                
Financial targets achievement period end   June 30, 2014                                      
Preliminary valuation of contingent consideration 22,100,000 (2,083,000)   5,737,000                                  
Goodwill 79,757,000 79,757,000 56,661,000 (3,902,000)   56,661,000                             79,800,000
Deductible tax expense   35.6                                      
Acquired intangible assets 20,600,000         14,168,000           19,200,000 1,400,000 8,900,000 4,000,000     1,300,000      
Approximate useful life             17 years 10 months       10 years 4 years 70 months   15 months 35 months   20 months 60 months  
Acquisition costs incurred   900,000     1,500,000       100,000   100,000                    
Purchase price allocation, working capital                   500,000                      
Percentage of cash paid on purchase price                   60.00%                      
Cash paid for acquisition excluding working capital adjustment                   1,800,000                      
Remainder of the purchase price payable in installments         10,000,000         1,200,000                      
Number of installments payable, in years                   3,000,000                      
Remaining portion of purchase price paid, after adjustment for foreign currency translation       11,200,000                                  
Decrease in goodwill     $ 2,300,000