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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Investments, Owned, Federal Income Tax Note [Line Items]
Effective income tax rate reconciliation at federal statutory income tax rate			21.00%	35.00%
Income Tax Expense (Benefit)	$ 5,338	$ 10,728	$ 21,209	$ 32,321
Effective Income Tax Rate Reconciliation, Percent	53.40%	36.20%	26.80%	34.20%
Deferred Income Tax Assets, Net					$ 3,100

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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

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