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Future Minimum Lease Payments Required Under These Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Capital Leases 2013	$ 1,350
Capital Leases 2014	1,061
Capital Leases 2015	715
Capital Leases 2016	644
Capital Leases 2017	617
Capital Leases Thereafter	1,054
Capital Leases Total minimum lease payments	5,891
Interest	(970)
Present value of net minimum lease payments	4,921
Operating Leases 2013	2,925
Operating Leases 2014	2,201
Operating Leases 2015	1,476
Operating Leases 2016	1,257
Operating Leases 2017	1,047
Operating Leases Thereafter	1,306
Operating Leases Total minimum lease payments	$ 10,212

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