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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income	$ 5,275us-gaap_ProfitLoss	$ 12,339us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,376us-gaap_DepreciationAndAmortization	10,172us-gaap_DepreciationAndAmortization
Interest accretion of convertible notes discount	2,799us-gaap_AmortizationOfDebtDiscountPremium	2,587us-gaap_AmortizationOfDebtDiscountPremium
Employee share-based compensation expense	5,752us-gaap_StockOptionPlanExpense	3,957us-gaap_StockOptionPlanExpense
Financing costs amortization	326us-gaap_AmortizationOfFinancingCosts	326us-gaap_AmortizationOfFinancingCosts
Unrealized foreign currency transaction (gain) loss	(60)us-gaap_ForeignCurrencyTransactionGainLossUnrealized	1,072us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Other non-cash operating activities	642us-gaap_OtherNoncashIncomeExpense	118us-gaap_OtherNoncashIncomeExpense
Changes in asset and liabilities, net of acquisitions:
Accounts receivable	(6,875)us-gaap_IncreaseDecreaseInAccountsReceivable	44,543us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory	(18,761)us-gaap_IncreaseDecreaseInInventories	(12,144)us-gaap_IncreaseDecreaseInInventories
Unbilled contract revenues and other assets	3,442gtls_IncreaseDecreaseInUnbilledReceivablesAndOtherCurrentAssets	(28,844)gtls_IncreaseDecreaseInUnbilledReceivablesAndOtherCurrentAssets
Accounts payable and other liabilities	(8,008)gtls_IncreaseDecreaseInAccountsPayableAndOtherCurrentLiabilities	(20,392)gtls_IncreaseDecreaseInAccountsPayableAndOtherCurrentLiabilities
Customer advances and billings in excess of contract revenue	5,592gtls_IncreaseDecreaseInCustomerAdvancesAndBillingsInExcessOfCost	7,127gtls_IncreaseDecreaseInCustomerAdvancesAndBillingsInExcessOfCost
Net Cash Provided By Operating Activities	1,500us-gaap_NetCashProvidedByUsedInOperatingActivities	20,861us-gaap_NetCashProvidedByUsedInOperatingActivities
INVESTING ACTIVITIES
Capital expenditures	(14,828)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(10,417)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Advance payment on acquisition	0gtls_Advancepaymentonacquisition	(4,624)gtls_Advancepaymentonacquisition
Proceeds from sale of assets	8us-gaap_ProceedsFromSalesOfAssetsInvestingActivities	34us-gaap_ProceedsFromSalesOfAssetsInvestingActivities
Acquisition of business	(320)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net Cash Used In Investing Activities	(15,140)us-gaap_NetCashProvidedByUsedInInvestingActivities	(15,007)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES
Borrowings on revolving credit facilities	0us-gaap_ProceedsFromLinesOfCredit	3,283us-gaap_ProceedsFromLinesOfCredit
Repayments on revolving credit facilities	0us-gaap_RepaymentsOfLinesOfCredit	(3,252)us-gaap_RepaymentsOfLinesOfCredit
Payments on long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(938)us-gaap_RepaymentsOfLongTermDebt
Proceeds from exercise of stock options	422us-gaap_ProceedsFromStockOptionsExercised	516us-gaap_ProceedsFromStockOptionsExercised
Excess tax (deficiency) benefit from share-based compensation	(482)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1,564us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Common stock repurchases	(808)us-gaap_PaymentsForRepurchaseOfCommonStock	(3,174)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from (Payments for) Other Financing Activities	(157)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities	0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net Cash Used In By Financing Activities	(1,025)us-gaap_NetCashProvidedByUsedInFinancingActivities	(2,001)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash	(5,624)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents	(779)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents	(20,289)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	3,074us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period	103,656us-gaap_CashAndCashEquivalentsAtCarryingValue	137,345us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 83,367us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 140,419us-gaap_CashAndCashEquivalentsAtCarryingValue

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Section 45

-Paragraph 14

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

+ Details

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6513228



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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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