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Commitments and Contingencies - Summary of Future Minimum Rental Commitment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Operating Leased Assets [Line Items]
2013	$ 34,093
2014	29,156
2015	23,746
2016	23,023
2017	18,286
Thereafter	48,711
Total minimum lease payments	$ 177,015

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