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Income Taxes - Reconciliation Between Statutory Tax Rate to Income Before Income Taxes and Actual Provision for Income Taxes (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
PRC income tax rate	25.00%	25.00%	25.00%
Expenses not deductible for tax purposes	0.04%	0.38%	0.14%
Effect of tax-free investment income	(1.37%)	(0.49%)	(2.03%)
Effect of different tax rate of subsidiary operation in other jurisdiction	(5.13%)	(2.54%)	(3.30%)
Effect of deferred tax asset allowance	5.85%	1.57%	1.07%
Effect of tax holidays	(2.60%)	(1.00%)	(0.73%)
Effect of income from equity in Fund of Fund	1.27%	0.49%	1.92%
Effect of true-ups	(0.47%)	(1.51%)	0.84%
Effect of others	0.14%	0.10%	0.01%
Effective Income Tax Rate Reconciliation, Percent, Total	22.73%	22.00%	22.92%

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Effective income tax rate reconciliation income from equity in fund of fund.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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