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Deferred Tax Liability (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Deferred tax liability - noncurrent	$ (6,369,035)	$ (6,388,537)
Deferred tax liability - current	(2,179,262)	(1,624,665)
System maintenance cost
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Deferred tax asset - noncurrent	38,317	33,146
Depreciation of fixed assets
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Deferred tax asset - noncurrent	24,255,713	25,527,126
Sales type lease
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Deferred tax liability - noncurrent	$ (30,663,065)	$ (31,948,809)

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References+ Details