Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Deferred tax liabilities	$ 284,453,000	$ 259,453,000
Deferred tax assets	11,707,000	20,026,000
Deferred Tax Assets, Net, Noncurrent	22,313,000	2,875,000
Income tax payments	35,239,000	13,148,000	63,680,000
Tax benefit (expense) allocated to stockholders' equity for compensation expense for income tax purposes in excess of amounts recognized for financial reporting purposes	1,800,000	4,100,000	4,900,000
Income tax refund	26,361,000	18,681,000	27,206,000
Deferred tax assets gross	91,041,000	79,007,000
Deferred tax asset, valuation allowance	22,248,000	22,248,000
Unrecognized tax benefits, if recognized, would impact effective tax rate	900,000	1,200,000	1,800,000
Amount accrued for the payment of interest and penalties	400,000	300,000	600,000
Unrecognized tax positions which may be recognized as a result of a lapse of the statute of limitations	400,000
Net tax benefit for expirations of statutes of limitations	500,000
Bonus tax depreciation	206,200,000	190,500,000	145,700,000
Federal Net Operating Loss Carryforward [Member]
Income Taxes [Line Items]
Deferred tax assets gross	800,000
Scenario 1
Income Taxes [Line Items]
Amount of future federal taxable income needed to fully realize the deferred income tax assets related to federal net operating loss carryforwards	100,000
Small Business Jobs Act
Income Taxes [Line Items]
Bonus first-year depreciation deduction rate	50.00%
Qualified property additions		201,800,000	199,900,000
Bonus tax depreciation		100,900,000	199,900,000
Small Business Jobs Act | Maximum
Income Taxes [Line Items]
Bonus first-year depreciation deduction rate	100.00%
Federal
Income Taxes [Line Items]
Income tax payments	30,000,000	5,100,000	53,200,000
Income tax refund	25,100,000	16,700,000	26,200,000
Net operating loss carryforwards	2,400,000	2,800,000	79,300,000
Federal | Expire In 2016 Through 2018 | Section 382 Limitation
Income Taxes [Line Items]
Net operating loss carryforwards	2,400,000
Net operating loss carryforwards, annual limitation	5,000
Federal | Scenario 1
Income Taxes [Line Items]
Number of years required to generate future taxable income	5 years
State
Income Taxes [Line Items]
Net income tax payments	2,900,000	2,900,000	7,600,000
Operating loss carryforwards not subject to expiration	3,300,000
State | Expire In 2019 Through 2031
Income Taxes [Line Items]
Net operating loss carryforwards	64,900,000	44,400,000	73,300,000
Foreign
Income Taxes [Line Items]
Net income tax payments	2,300,000	5,200,000	2,900,000
Deferred tax assets gross	32,700,000
Foreign | Expire In 2014 Through 2030
Income Taxes [Line Items]
Net operating loss carryforwards	117,600,000	34,400,000	39,600,000
Federal [Member]
Income Taxes [Line Items]
Deferred tax asset, valuation allowance		800,000
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Deferred tax asset, valuation allowance	$ 21,400,000