Goodwill and Other Intangible Assets - Schedule Of Estimated Amortization Expense For Existing Intangible Assets For Each Of The Five Succeeding Years (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Schedule Of Estimated Future Amortization Expense [Line Items]
Remaining 2013	$ 3,163
2014	3,744
2015	3,479
2016	3,411
2017	$ 3,402

Goodwill and Other Intangible Assets - Schedule Of Estimated Amortization Expense For Existing Intangible Assets For Each Of The Five Succeeding Years (Detail) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2012

Schedule Of Estimated Future Amortization Expense [Line Items]

$ 3,163

3,744

3,479

3,411

$ 3,402