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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Disclosure threshold for future non-cancelable purchase and service obligations | greater than $100,000 and one year |  |
Non-cancelable purchase and service obligations [Abstract] |  |  |
2015 | $ 10,224,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary |  |
2016 | 7,899,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary |  |
2017 | 4,179,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary |  |
2018 | 2,628,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary |  |
2019 | 1,774,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary |  |
Thereafter | 2,693,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears |  |
Total obligations | 29,397,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount |  |
Texas Sales and Use Tax Assessment [Abstract] |  |  |
Texas Sales and Use Tax Assessment |  | 933,000 nsp_TexasSalesandUseTaxAssessment | 782,000 nsp_TexasSalesandUseTaxAssessment
Massachusetts Tax Assessment [Abstract] |  |  |
Provision for interest or penalties related to uncertain tax positions |  |  | $ 2,500,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued

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- Definition The future non-cancelable purchase and service obligations disclosure threshold. + References No definition available. + Details
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- Definition The Texas Sales and Use tax assessment presented to the Company by the State of Texas, currently under protest by the Company. + References No definition available. + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the four fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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