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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] |  |  |
Revenues (gross billings of $14.187 billion, $13.462 billion and $12.992 billion, less worksite employee payroll cost of $11.829 billion, $11.206 billion and $10.833 billion, respectively) | $ 2,357,788 us-gaap_SalesRevenueNet | $ 2,256,112 us-gaap_SalesRevenueNet | $ 2,158,824 us-gaap_SalesRevenueNet
Direct costs: |  |  |
Payroll taxes, benefits and workers’ compensation costs | 1,953,983 nsp_PayrollTaxesBenefitsAndWorkersCompensationCosts | 1,862,861 nsp_PayrollTaxesBenefitsAndWorkersCompensationCosts | 1,776,603 nsp_PayrollTaxesBenefitsAndWorkersCompensationCosts
Gross profit | 403,805 us-gaap_GrossProfit | 393,251 us-gaap_GrossProfit | 382,221 us-gaap_GrossProfit
Operating expenses: |  |  |
Salaries, wages and payroll taxes | 200,118 nsp_SalariesWagesAndPayrollTaxes | 181,444 nsp_SalariesWagesAndPayrollTaxes | 168,807 nsp_SalariesWagesAndPayrollTaxes
Stock-based compensation | 11,053 us-gaap_AllocatedShareBasedCompensationExpense | 11,103 us-gaap_AllocatedShareBasedCompensationExpense | 9,814 us-gaap_AllocatedShareBasedCompensationExpense
Commissions | 15,285 us-gaap_SalesCommissionsAndFees | 14,581 us-gaap_SalesCommissionsAndFees | 14,515 us-gaap_SalesCommissionsAndFees
Advertising | 22,183 us-gaap_AdvertisingExpense | 23,795 us-gaap_AdvertisingExpense | 21,586 us-gaap_AdvertisingExpense
General and administrative expenses | 82,618 us-gaap_GeneralAndAdministrativeExpense | 81,699 us-gaap_GeneralAndAdministrativeExpense | 77,564 us-gaap_GeneralAndAdministrativeExpense
Impairment charges | 3,687 us-gaap_AssetImpairmentCharges | 3,342 us-gaap_AssetImpairmentCharges | 4,191 us-gaap_AssetImpairmentCharges
Depreciation and amortization | 21,387 us-gaap_DepreciationAndAmortization | 21,064 us-gaap_DepreciationAndAmortization | 18,250 us-gaap_DepreciationAndAmortization
Total operating expenses | 356,331 us-gaap_OperatingExpenses | 337,028 us-gaap_OperatingExpenses | 314,727 us-gaap_OperatingExpenses
Operating income | 47,474 us-gaap_OperatingIncomeLoss | 56,223 us-gaap_OperatingIncomeLoss | 67,494 us-gaap_OperatingIncomeLoss
Other income (expense): |  |  |
Interest, net | 106 us-gaap_InterestIncomeExpenseNonoperatingNet | 158 us-gaap_InterestIncomeExpenseNonoperatingNet | 609 us-gaap_InterestIncomeExpenseNonoperatingNet
Other, net | 47 us-gaap_OtherNonoperatingIncomeExpense | (2,649)us-gaap_OtherNonoperatingIncomeExpense | 187 us-gaap_OtherNonoperatingIncomeExpense
Income before income tax expense | 47,627 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 53,732 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 68,290 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 19,623 us-gaap_IncomeTaxExpenseBenefit | 21,700 us-gaap_IncomeTaxExpenseBenefit | 27,888 us-gaap_IncomeTaxExpenseBenefit
Net income | 28,004 us-gaap_NetIncomeLoss | 32,032 us-gaap_NetIncomeLoss | 40,402 us-gaap_NetIncomeLoss
Less distributed and undistributed earnings allocated to participating securities | (2,002)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings | (916)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings | (1,224)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings
Net income allocated to common shares | $ 26,002 nsp_NetIncomeLossAvailableToCommonShareholdersBasic | $ 31,116 nsp_NetIncomeLossAvailableToCommonShareholdersBasic | $ 39,178 nsp_NetIncomeLossAvailableToCommonShareholdersBasic
Basic net income per share of common stock (in dollars per share) | $ 1.05 us-gaap_EarningsPerShareBasic | $ 1.25 us-gaap_EarningsPerShareBasic | $ 1.57 us-gaap_EarningsPerShareBasic
Diluted net income per share of common stock (in dollars per share) | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 1.25 us-gaap_EarningsPerShareDiluted | $ 1.56 us-gaap_EarningsPerShareDiluted

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