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Goodwill - Additional Information (Detail)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Nov. 05, 2013
Innovative Systems GmbH[Member]
EUR (€)
Dec. 31, 2013
Duran Audio BV [Member]
Professional [Member]
USD ($)
Dec. 31, 2013
Duran Audio BV [Member]
Professional [Member]
USD ($)
Dec. 31, 2012
Interchain Solution Private Limited [Member]
Infotainment [Member]
USD ($)
Dec. 31, 2012
Interchain Solution Private Limited [Member]
Infotainment [Member]
USD ($)
Goodwill [Line Items]                  
Increase in goodwill           $ 15.9 $ 15.9 $ 0.6 $ 0.6
Goodwill impairment charges 0 0 0 0          
Dispute settlement amount         € 16.3