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Income Taxes - Schedule of Reconciliation of Differences between Federal Income Tax at Statutory Rates and Actual Income Tax Expense on Income from Continuing Operations (Detail)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Income Tax Disclosure [Abstract] | |||
| Tax expense at statutory rate | 35.00% | 35.00% | 35.00% |
| Increase (decrease) in tax rate resulting from: | |||
| Federal income tax assumed by noncontrolling interests | (24.90%) | (48.60%) | (37.60%) |
| Change in valuation allowance | (6.60%) | 27.40% | 12.20% |
| State income taxes, net of federal tax benefit | 1.80% | (1.50%) | (0.10%) |
| Non-deductible stock issuance costs | 3.70% | ||
| Other, net | 0.10% | 0.20% | 0.20% |
| Income tax expense | 5.40% | 16.20% | 9.70% |