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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Current assets: |  |
Cash and cash equivalents | $ 276,456 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 225,755 us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash | 44,040 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 51,928 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Marketable securities | 28,631 us-gaap_MarketableSecuritiesCurrent | 46,340 us-gaap_MarketableSecuritiesCurrent
Accounts receivable, net: |  |
Trade | 12,010 us-gaap_AccountsReceivableNetCurrent | 7,453 us-gaap_AccountsReceivableNetCurrent
Unbilled | 160,154 nsp_Unbilled | 199,628 nsp_Unbilled
Other | 2,952 us-gaap_OtherReceivables | 2,928 us-gaap_OtherReceivables
Prepaid insurance | 21,301 us-gaap_PrepaidInsurance | 10,638 us-gaap_PrepaidInsurance
Other current assets | 17,649 us-gaap_OtherAssetsCurrent | 12,053 us-gaap_OtherAssetsCurrent
Income taxes receivable | 0 us-gaap_IncomeTaxesReceivable | 409 us-gaap_IncomeTaxesReceivable
Deferred income taxes | 6,316 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 8,185 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Total current assets | 569,509 us-gaap_AssetsCurrent | 565,317 us-gaap_AssetsCurrent
Property and equipment: |  |
Land | 5,214 us-gaap_Land | 4,115 us-gaap_Land
Buildings and improvements | 70,471 us-gaap_BuildingsAndImprovementsGross | 67,939 us-gaap_BuildingsAndImprovementsGross
Computer hardware and software | 89,204 nsp_ComputerHardwareAndSoftware | 85,241 nsp_ComputerHardwareAndSoftware
Software development costs | 41,314 nsp_SoftwareDevelopmentCosts | 38,522 nsp_SoftwareDevelopmentCosts
Furniture and fixtures | 38,604 us-gaap_FurnitureAndFixturesGross | 36,479 us-gaap_FurnitureAndFixturesGross
Aircraft | 35,879 us-gaap_FlightEquipmentOwnedGross | 35,879 us-gaap_FlightEquipmentOwnedGross
Total property and equipment, gross | 280,686 us-gaap_PropertyPlantAndEquipmentGross | 268,175 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization | (196,341)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (181,760)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net | 84,345 us-gaap_PropertyPlantAndEquipmentNet | 86,415 us-gaap_PropertyPlantAndEquipmentNet
Other assets: |  |
Prepaid health insurance | 9,000 nsp_PrepaidHealthInsurance | 9,000 nsp_PrepaidHealthInsurance
Deposits – health insurance | 3,700 nsp_DepositsHealthInsurance | 3,700 nsp_DepositsHealthInsurance
Deposits – workers’ compensation | 113,934 nsp_DepositsWorkersCompensation | 81,878 nsp_DepositsWorkersCompensation
Goodwill and other intangible assets, net | 14,457 nsp_GoodwillAndOtherIntangibleAssetsNet | 18,434 nsp_GoodwillAndOtherIntangibleAssetsNet
Other assets | 1,725 us-gaap_OtherAssetsNoncurrent | 1,816 us-gaap_OtherAssetsNoncurrent
Total other assets | 142,816 us-gaap_OtherAssets | 114,828 us-gaap_OtherAssets
Total assets | 796,670 us-gaap_Assets | 766,560 us-gaap_Assets
Current liabilities: |  |
Accounts payable | 4,674 us-gaap_AccountsPayableCurrent | 2,678 us-gaap_AccountsPayableCurrent
Payroll taxes and other payroll deductions payable | 176,341 nsp_AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent | 165,604 nsp_AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent
Accrued worksite employee payroll cost | 192,396 nsp_AccruedWorksiteEmployeePayrollCosts | 173,801 nsp_AccruedWorksiteEmployeePayrollCosts
Accrued health insurance costs | 18,329 nsp_AccruedHealthInsuranceCosts | 5,103 nsp_AccruedHealthInsuranceCosts
Accrued workers’ compensation costs | 45,592 us-gaap_WorkersCompensationLiabilityCurrent | 52,930 us-gaap_WorkersCompensationLiabilityCurrent
Accrued corporate payroll and commissions | 32,644 nsp_AccruedCorporatePayrollAndCommissionsEarned | 21,611 nsp_AccruedCorporatePayrollAndCommissionsEarned
Other accrued liabilities | 22,444 us-gaap_AccruedLiabilitiesCurrent | 14,960 us-gaap_AccruedLiabilitiesCurrent
Income tax payable | 4,031 us-gaap_TaxesPayableCurrent | 0 us-gaap_TaxesPayableCurrent
Total current liabilities | 496,451 us-gaap_LiabilitiesCurrent | 436,687 us-gaap_LiabilitiesCurrent
Noncurrent liabilities: |  |
Accrued workers’ compensation costs | 92,048 us-gaap_WorkersCompensationLiabilityNoncurrent | 68,905 us-gaap_WorkersCompensationLiabilityNoncurrent
Deferred income taxes | 4,075 us-gaap_DeferredTaxLiabilitiesNoncurrent | 7,696 us-gaap_DeferredTaxLiabilitiesNoncurrent
Total noncurrent liabilities | 96,123 us-gaap_LiabilitiesNoncurrent | 76,601 us-gaap_LiabilitiesNoncurrent
Commitments and contingencies |  |
Stockholders’ equity: |  |
Preferred stock, par value $0.01 per share: Shares authorized - 20,000 Shares issued and outstanding - none | 0 us-gaap_PreferredStockValue | 0 us-gaap_PreferredStockValue
Common stock, par value $0.01 per share: Shares authorized - 60,000 Shares issued - 30,758 at December 31, 2014 and 2013 | 308 us-gaap_CommonStockValue | 308 us-gaap_CommonStockValue
Additional paid-in capital | 137,769 us-gaap_AdditionalPaidInCapitalCommonStock | 135,653 us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost – 5,425 and 5,175 at December 31, 2014 and 2013, respectively | (148,465)us-gaap_TreasuryStockValue | (138,688)us-gaap_TreasuryStockValue
Accumulated other comprehensive income, net of tax | 3 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 29 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings | 214,481 us-gaap_RetainedEarningsAccumulatedDeficit | 255,970 us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity | 204,096 us-gaap_StockholdersEquity | 253,272 us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity | $ 796,670 us-gaap_LiabilitiesAndStockholdersEquity | $ 766,560 us-gaap_LiabilitiesAndStockholdersEquity

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