Contractual Maturities on Finance Lease Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Schedule Of Capital Leases Future Minimum Payments Receivable [Line Items]
Contractual maturities, 2013	$ 3,583
Contractual maturities, 2014	3,566
Contractual maturities, 2015	3,939
Contractual maturities, 2016	1,048
Total	$ 12,136

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Amount of minimum lease payments to be received by the lessor for capital leases.

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Amount of minimum lease payments to be received by the lessor in the next fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments to be received by the lessor in the fourth fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments to be received by the lessor in the third fiscal year following the latest fiscal year for capital leases.

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Amount of minimum lease payments to be received by the lessor in the second fiscal year following the latest fiscal year for capital leases.

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