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]
Revenue	$ 12,974,930us-gaap_Revenues	$ 11,094,527us-gaap_Revenues	$ 5,485,206us-gaap_Revenues
Cost of revenue	11,508,521us-gaap_CostOfServices	9,895,517us-gaap_CostOfServices	4,786,499us-gaap_CostOfServices
Gross profit	1,466,409us-gaap_GrossProfit	1,199,010us-gaap_GrossProfit	698,707us-gaap_GrossProfit
Selling and administrative expense	405,208	379,485	227,948
Intangibles amortization	66,506us-gaap_AmortizationOfIntangibleAssets	61,111us-gaap_AmortizationOfIntangibleAssets	22,613us-gaap_AmortizationOfIntangibleAssets
Equity earnings	(25,225)	(23,474)	(17,931)
Other operating (income) expense, net	(2,373)us-gaap_OtherOperatingIncomeExpenseNet	1,643us-gaap_OtherOperatingIncomeExpenseNet	(566)us-gaap_OtherOperatingIncomeExpenseNet
Acquisition and integration related costs	39,685	95,737	11,000
Income from operations	982,608us-gaap_OperatingIncomeLoss	684,508us-gaap_OperatingIncomeLoss	455,643us-gaap_OperatingIncomeLoss
Interest expense	(83,590)us-gaap_InterestExpense	(87,578)us-gaap_InterestExpense	(19,606)us-gaap_InterestExpense
Interest income	8,524us-gaap_InvestmentIncomeInterest	6,930us-gaap_InvestmentIncomeInterest	8,029us-gaap_InvestmentIncomeInterest
Income before taxes	907,542	603,860	444,066
Income tax expense	(271,417)us-gaap_IncomeTaxExpenseBenefit	(91,270)us-gaap_IncomeTaxExpenseBenefit	(127,003)us-gaap_IncomeTaxExpenseBenefit
Net income	636,125us-gaap_ProfitLoss	512,590us-gaap_ProfitLoss	317,063us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests	(92,518)	(58,470)	(15,408)
Net income attributable to CB&I	543,607us-gaap_NetIncomeLoss	454,120us-gaap_NetIncomeLoss	301,655us-gaap_NetIncomeLoss
Net income attributable to CB&I per share:
Basic (in dollars per share)	$ 5.03us-gaap_EarningsPerShareBasic	$ 4.29us-gaap_EarningsPerShareBasic	$ 3.12us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 4.98us-gaap_EarningsPerShareDiluted	$ 4.23us-gaap_EarningsPerShareDiluted	$ 3.07us-gaap_EarningsPerShareDiluted
Cash dividends on shares:
Amount	$ 30,246us-gaap_DividendsCommonStockCash	$ 21,453us-gaap_DividendsCommonStockCash	$ 19,394us-gaap_DividendsCommonStockCash
Per share (in dollars per share)	$ 0.28	$ 0.20	$ 0.20

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