Income Taxes - Income Tax Rate Reconciliation (Detail)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.60%	3.20%	1.30%
Expiration of capital loss carryover	(17.60%)	(25.50%)	0.00%
Capitalized acquisition costs	9.20%	25.30%	(38.80%)
Permanent items	(5.70%)	(7.60%)	3.60%
Provision to return adjustments	(7.80%)	(0.80%)	(0.10%)
Actual income tax rate	14.70%	29.60%	1.00%

Effective Income Tax Rate Reconciliation, Expiration of Capital Loss Carryover, Percent

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Percentage of permanent items pertaining to continuing operations.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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 attributable to revisions of previously reported income tax expense.

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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 state and local income tax expense (benefit), net of federal tax expense (benefit).

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