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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 13,787us-gaap_NetIncomeLoss $ 9,564us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 5,285us-gaap_DepreciationAndAmortization 5,234us-gaap_DepreciationAndAmortization
Impairment charges and other 9,807us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges
Amortization of marketable securities 316us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium 510us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium
Stock-based compensation 2,423us-gaap_ShareBasedCompensation 2,400us-gaap_ShareBasedCompensation
Deferred income taxes 5,594us-gaap_DeferredIncomeTaxExpenseBenefit 6,387us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Restricted cash (1,112)nsp_IncreaseDecreaseInRestrictedCashNetFromAcquisitions (234)nsp_IncreaseDecreaseInRestrictedCashNetFromAcquisitions
Accounts receivable (84,662)us-gaap_IncreaseDecreaseInAccountsReceivable (12,390)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid insurance (15,359)us-gaap_IncreaseDecreaseInPrepaidExpense (24,155)us-gaap_IncreaseDecreaseInPrepaidExpense
Other current assets (3,432)us-gaap_IncreaseDecreaseInOtherCurrentAssets (7,175)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other assets (1,642)us-gaap_IncreaseDecreaseInOtherOperatingAssets (2,964)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (1,613)us-gaap_IncreaseDecreaseInAccountsPayableTrade (87)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Payroll taxes and other payroll deductions payable 326us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities (1,619)us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
Accrued worksite employee payroll expense 31,168us-gaap_IncreaseDecreaseInAccruedSalaries 13,510us-gaap_IncreaseDecreaseInAccruedSalaries
Accrued health insurance costs 7,260us-gaap_IncreaseDecreaseInHealthCareInsuranceLiabilities 20,605us-gaap_IncreaseDecreaseInHealthCareInsuranceLiabilities
Accrued workers’ compensation costs 5,360us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities 2,837us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities
Accrued corporate payroll, commissions and other accrued liabilities (7,473)nsp_AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities 5,340nsp_AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities
Income taxes payable/receivable (3,983)us-gaap_IncreaseDecreaseInIncomeTaxes (8,872)us-gaap_IncreaseDecreaseInIncomeTaxes
Total adjustments (51,737)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (673)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities (37,950)us-gaap_NetCashProvidedByUsedInOperatingActivities 8,891us-gaap_NetCashProvidedByUsedInOperatingActivities
Marketable securities:    
Purchases (3,964)us-gaap_PaymentsToAcquireMarketableSecurities (7,668)us-gaap_PaymentsToAcquireMarketableSecurities
Proceeds from dispositions 824nsp_MarketableSecuritiesProceedsFromDispositions 0nsp_MarketableSecuritiesProceedsFromDispositions
Proceeds from maturities 2,620us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 6,595us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Property and equipment (2,423)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,379)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (2,943)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,452)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Purchase of treasury stock (5,719)nsp_TreasuryStockAcquired (13,884)nsp_TreasuryStockAcquired
Dividends paid (4,844)us-gaap_PaymentsOfDividendsCommonStock (4,351)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from the exercise of stock options 374us-gaap_ProceedsFromStockOptionsExercised 163us-gaap_ProceedsFromStockOptionsExercised
Income tax benefit from stock-based compensation 2,929us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 78us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Other 285us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 318us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities (6,975)us-gaap_NetCashProvidedByUsedInFinancingActivities (17,676)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents (47,868)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (12,237)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 276,456us-gaap_CashAndCashEquivalentsAtCarryingValue 225,755us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 228,588us-gaap_CashAndCashEquivalentsAtCarryingValue $ 213,518us-gaap_CashAndCashEquivalentsAtCarryingValue