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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
Cash flows from operating activities:    
Net income (loss) $ (13,148)us-gaap_ProfitLoss $ 4,910us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Benefit of deferred income taxes (10,254)us-gaap_DeferredIncomeTaxExpenseBenefit (7,610)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization 19,470us-gaap_DepreciationAndAmortization 12,486us-gaap_DepreciationAndAmortization
Non-cash interest on convertible notes   95us-gaap_OtherNoncashExpense
Provision for bad debts 2,881us-gaap_ProvisionForDoubtfulAccounts 1,341us-gaap_ProvisionForDoubtfulAccounts
Stock-based compensation 10,329us-gaap_ShareBasedCompensation 7,276us-gaap_ShareBasedCompensation
Loss on the disposition of property and equipment 253us-gaap_GainLossOnSaleOfPropertyPlantEquipment 286us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Changes in operating accounts:    
Accounts receivable 17,986us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables (11,402)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Inventories (20,011)us-gaap_IncreaseDecreaseInInventories (13,034)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (2,784)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (7,375)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (5,815)us-gaap_IncreaseDecreaseInAccountsPayable 4,267us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities (4,373)us-gaap_IncreaseDecreaseInAccruedLiabilities 8,273us-gaap_IncreaseDecreaseInAccruedLiabilities
Customer deposits 1,070us-gaap_IncreaseDecreaseInCustomerDeposits 976us-gaap_IncreaseDecreaseInCustomerDeposits
Deferred revenue 2,535us-gaap_IncreaseDecreaseInDeferredRevenue (396)us-gaap_IncreaseDecreaseInDeferredRevenue
Other operating assets and liabilities 924us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 215us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities (937)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 308us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Purchases of property and equipment (3,693)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,551)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Additions to license and patent costs (203)us-gaap_PaymentsToAcquireIntangibleAssets (210)us-gaap_PaymentsToAcquireIntangibleAssets
Cash paid for acquisitions, net of cash assumed (77,984)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (2,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Other investing activities (600)us-gaap_PaymentsToAcquireEquityMethodInvestments (100)us-gaap_PaymentsToAcquireEquityMethodInvestments
Net cash used in investing activities (82,480)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (5,861)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Tax benefits from share-based payment arrangements 447us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 5,448us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from exercise of stock options and restricted stock, net 360us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 484us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Repayment of capital lease obligations (176)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (44)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net cash provided by financing activities 631us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 5,888us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (2,180)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 53us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (84,966)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 388us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 284,862us-gaap_CashAndCashEquivalentsAtCarryingValue 306,316us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period 199,896us-gaap_CashAndCashEquivalentsAtCarryingValue 306,704us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Cash Flow Information:    
Cash interest payments 143us-gaap_InterestPaidNet 132us-gaap_InterestPaidNet
Cash income tax payments 1,707us-gaap_IncomeTaxesPaidNet 2,407us-gaap_IncomeTaxesPaidNet
Transfer of equipment from inventory to property and equipment, net 2,539ddd_TransferOfEquipmentFromInventoryToPropertyAndEquipmentNet [1] 2,300ddd_TransferOfEquipmentFromInventoryToPropertyAndEquipmentNet [1]
Transfer of equipment to inventory from property and equipment, net 1,822ddd_TransferOfEquipmentToInventoryFromPropertyAndEquipmentNet [2] 16ddd_TransferOfEquipmentToInventoryFromPropertyAndEquipmentNet [2]
Stock issued for acquisitions of businesses   $ 2,000us-gaap_StockIssuedDuringPeriodValueAcquisitions
[1] Inventory is transferred from inventory to property and equipment at cost when the Company requires additional machines for training or demonstration or for placement into Quickparts’ locations.
[2] In general, an asset is transferred from property and equipment, net into inventory at its net book value when the Company has identified a potential sale for a used machine.