Future Minimum Lease Payments under Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Schedule of Capital Lease Obligations [Line Items]
2013	$ 13,781
2014	13,355
2015	2,593
2016	1,210
2017	335
Total minimum lease payments	31,274
Less amount representing interest	856
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Total	$ 30,418

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments maturing in the fifth fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments maturing in the forth fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments maturing in the third fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments maturing in the second fiscal year following the latest fiscal year for capital leases.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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