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Income Taxes - Provision for Income Taxes Varies from Federal Statutory Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Expected tax expense	$ 13,902us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 6,491us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income tax, net of federal benefit	254us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	488us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Percentage depletion	(312)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion	(422)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
Other, net		261us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax provision	$ 13,844us-gaap_IncomeTaxExpenseBenefit	$ 6,818us-gaap_IncomeTaxExpenseBenefit

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Amount 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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-Section S99

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 nondeductible depletion.

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Amount 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 other adjustments.

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Amount 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 state and local income tax expense (benefit).

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