Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 7,851,250us-gaap_SalesRevenueServicesNet	$ 6,522,842us-gaap_SalesRevenueServicesNet	$ 5,920,269us-gaap_SalesRevenueServicesNet
Cost of services (including depreciation)	6,617,730us-gaap_CostOfServices	5,467,389us-gaap_CostOfServices	4,982,562us-gaap_CostOfServices
Gross profit	1,233,520us-gaap_GrossProfit	1,055,453us-gaap_GrossProfit	937,707us-gaap_GrossProfit
Selling, general and administrative expenses	722,038	501,010	434,894
Amortization of intangible assets	35,907us-gaap_AmortizationOfIntangibleAssets	27,515us-gaap_AmortizationOfIntangibleAssets	37,691us-gaap_AmortizationOfIntangibleAssets
Operating income	475,575us-gaap_OperatingIncomeLoss	526,928us-gaap_OperatingIncomeLoss	465,122us-gaap_OperatingIncomeLoss
Interest expense	(4,765)us-gaap_InterestExpense	(2,668)us-gaap_InterestExpense	(3,746)us-gaap_InterestExpense
Interest income	3,741us-gaap_InvestmentIncomeInterest	3,380us-gaap_InvestmentIncomeInterest	1,471us-gaap_InvestmentIncomeInterest
Equity in earnings (losses) of unconsolidated affiliates, including gain on sale of investment	(332)	112,744	2,084
Other income (expense), net	(1,102)us-gaap_OtherNonoperatingIncomeExpense	(1,135)us-gaap_OtherNonoperatingIncomeExpense	(351)us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes	473,117	639,249	464,580
Provision for income taxes	157,408us-gaap_IncomeTaxExpenseBenefit	217,940us-gaap_IncomeTaxExpenseBenefit	158,859us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	315,709	421,309	305,721
Income (loss) from discontinued operations, net of taxes	(627)		16,935
Net income	315,082us-gaap_ProfitLoss	421,309us-gaap_ProfitLoss	322,656us-gaap_ProfitLoss
Less: Net income attributable to non-controlling interests	18,368	19,388	16,027
Net income attributable to common stock	296,714	401,921	306,629
Amounts attributable to common stock:
Net income from continuing operations	297,341	401,921	289,694
Net income (loss) from discontinued operations	(627)		16,935
Net income attributable to common stock	$ 296,714	$ 401,921	$ 306,629
Earnings per share attributable to common stock - basic and diluted:
Continuing operations	$ 1.35	$ 1.87	$ 1.36
Discontinued operations			$ 0.08
Net income attributable to common stock	$ 1.35us-gaap_EarningsPerShareBasicAndDiluted	$ 1.87us-gaap_EarningsPerShareBasicAndDiluted	$ 1.44us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing earnings per share:
Weighted average basic shares outstanding	219,668	214,929	212,777
Weighted average diluted shares outstanding	219,690	214,978	212,835

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration