Future Minimum Annual Lease Commitments Under Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Payments Receivable [Line Items]
2013	$ 226
2014	226
2015	226
2016	11
2017	0
Capital Lease Obligations, Total	689
Less: Amount representing interest	103
Present value of minimum lease payments	586
Less: Current installments of obligations under capital leases	178
Capital lease, non current liability	$ 408

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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