Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
REVENUES	$ 426,000us-gaap_SalesRevenueServicesNet	$ 404,222us-gaap_SalesRevenueServicesNet
EXPENSES:
Operating	300,662us-gaap_OperatingCostsAndExpenses	287,380us-gaap_OperatingCostsAndExpenses
General and administrative	26,872us-gaap_GeneralAndAdministrativeExpense	25,392us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	28,685us-gaap_DepreciationAndAmortization	28,384us-gaap_DepreciationAndAmortization
Asset impairments	955us-gaap_AssetImpairmentCharges
Costs and Expenses	357,174us-gaap_CostsAndExpenses	341,156us-gaap_CostsAndExpenses
OPERATING INCOME	68,826us-gaap_OperatingIncomeLoss	63,066us-gaap_OperatingIncomeLoss
OTHER (INCOME) EXPENSE:
Interest expense, net	10,190	10,348
Other (income) expense	(26)us-gaap_OtherNonoperatingIncomeExpense	(387)us-gaap_OtherNonoperatingIncomeExpense
Total non-operating expense (income)	10,164us-gaap_NonoperatingIncomeExpense	9,961us-gaap_NonoperatingIncomeExpense
INCOME BEFORE INCOME TAXES	58,662	53,105
Income tax expense	(1,385)us-gaap_IncomeTaxExpenseBenefit	(1,367)us-gaap_IncomeTaxExpenseBenefit
INCOME BEFORE EQUITY IN SUBSIDIARIES	57,277	51,738
NET INCOME	57,277us-gaap_NetIncomeLoss	51,738us-gaap_NetIncomeLoss
Parent
Condensed Financial Statements, Captions [Line Items]
REVENUES	303,040	306,248
EXPENSES:
Operating	221,677	219,705
General and administrative	8,800	8,676
Depreciation and amortization	20,069	19,769
Costs and Expenses	250,546	248,150
OPERATING INCOME	52,494	58,098
OTHER (INCOME) EXPENSE:
Interest expense, net	8,427	8,602
Other (income) expense	171	(38)
Total non-operating expense (income)	8,598	8,564
INCOME BEFORE INCOME TAXES	43,896	49,534
Income tax expense	(176)	(220)
INCOME BEFORE EQUITY IN SUBSIDIARIES	43,720	49,314
Income from equity in subsidiaries	13,557	2,424
NET INCOME	57,277	51,738
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
REVENUES	335,223	311,247
EXPENSES:
Operating	291,248	280,948
General and administrative	18,072	16,716
Depreciation and amortization	8,616	8,615
Asset impairments	955
Costs and Expenses	318,891	306,279
OPERATING INCOME	16,332	4,968
OTHER (INCOME) EXPENSE:
Interest expense, net	1,763	1,746
Other (income) expense	(121)	(79)
Total non-operating expense (income)	1,642	1,667
INCOME BEFORE INCOME TAXES	14,690	3,301
Income tax expense	(1,209)	(1,147)
INCOME BEFORE EQUITY IN SUBSIDIARIES	13,481	2,154
NET INCOME	13,481	2,154
Consolidating Adjustments and Other
Condensed Financial Statements, Captions [Line Items]
REVENUES	(212,263)	(213,273)
EXPENSES:
Operating	(212,263)	(213,273)
Costs and Expenses	(212,263)	(213,273)
OTHER (INCOME) EXPENSE:
Other (income) expense	(76)	(270)
Total non-operating expense (income)	(76)	(270)
INCOME BEFORE INCOME TAXES	76	270
INCOME BEFORE EQUITY IN SUBSIDIARIES	76	270
Income from equity in subsidiaries	(13,557)	(2,424)
NET INCOME	$ (13,481)	$ (2,154)

Income (Loss) from Equity in Hundred Percent Owned Subsidiaries

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Total costs of sales and operating expenses for the period.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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

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The net amount of nonoperating interest income (expense).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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The net result for the period of deducting operating expenses from operating revenues.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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