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Investment in equipment and Leases, Net - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Leases Disclosure [Line Items] | |||||
| Depreciation expense on equipment | $ 259,000 | $ 361,000 | $ 571,000 | $ 692,000 | |
| Average estimated residual value of assets on operating leases | 10.00% | 10.00% | 10.00% | ||
| Revenue from contingent rental operating leases | $ 623,000 | $ 581,000 | $ 1,200,000 | $ 1,200,000 | |