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Goodwill and Other Intangible Assets (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Goodwill and Other Intangible Assets [Line Items] |  |  |
Goodwill and Other Intangibles Impairment | $ (2,485,000)nsp_GoodwillandOtherIntangiblesImpairment |  |
Goodwill and Intangible Asset Impairment | 2,485,000 us-gaap_GoodwillAndIntangibleAssetImpairment |  | 4,191,000 us-gaap_GoodwillAndIntangibleAssetImpairment
Impairment charges | 3,687,000 us-gaap_AssetImpairmentCharges | 3,342,000 us-gaap_AssetImpairmentCharges | 4,191,000 us-gaap_AssetImpairmentCharges
Gross Carrying Amount [Roll Forward] |  |  |
Goodwill and Other Intangibles Impairment, gross | (2,402,000)nsp_GoodwillandOtherIntangiblesImpairmentgross |  |
Total gross carrying amount and aggregate goodwill acquired [Abstract] |  |  |
Beg Bal Total gross carrying amount and aggregate goodwill acquired | 30,170,000 nsp_Totalgrosscarryingamountandaggregategoodwillacquired |  |
Goodwill and Other Intangibles Impairment, gross | (2,402,000)nsp_GoodwillandOtherIntangiblesImpairmentgross |  |
End Bal Total gross carrying amount and aggregate goodwill acquired | 27,768,000 nsp_Totalgrosscarryingamountandaggregategoodwillacquired | 30,170,000 nsp_Totalgrosscarryingamountandaggregategoodwillacquired |
Accumulated amortization [Abstract] |  |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | (83,000)nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles |  |
Amortization Expense | (1,492,000)us-gaap_AmortizationOfIntangibleAssets | (2,000,000)us-gaap_AmortizationOfIntangibleAssets | (1,800,000)us-gaap_AmortizationOfIntangibleAssets
Total accumulated amortization and accumulated impairment [Abstract] |  |  |
Beg Bal Total accumulated amortization and accumulated impairment | (11,736,000)nsp_Totalaccumulatedamortizationandaccumulatedimpairment |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | (83,000)nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles |  |
Amortization Expense | (1,492,000)us-gaap_AmortizationOfIntangibleAssets | (2,000,000)us-gaap_AmortizationOfIntangibleAssets | (1,800,000)us-gaap_AmortizationOfIntangibleAssets
End Bal Total accumulated amortization and accumulated impairment | (13,311,000)nsp_Totalaccumulatedamortizationandaccumulatedimpairment | (11,736,000)nsp_Totalaccumulatedamortizationandaccumulatedimpairment |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |
Amortization Expense | (1,492,000)us-gaap_AmortizationOfIntangibleAssets | (2,000,000)us-gaap_AmortizationOfIntangibleAssets | (1,800,000)us-gaap_AmortizationOfIntangibleAssets
Beg Bal Goodwill and other intangible assets, net | 18,434,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |  |
Goodwill and Other Intangibles Impairment | (2,485,000)nsp_GoodwillandOtherIntangiblesImpairment |  |
End Bal Goodwill and other intangible assets, net | 14,457,000 us-gaap_IntangibleAssetsNetIncludingGoodwill | 18,434,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |
Amortization [Abstract] |  |  |
Amortization expense related to purchased intangible assets | (1,492,000)us-gaap_AmortizationOfIntangibleAssets | (2,000,000)us-gaap_AmortizationOfIntangibleAssets | (1,800,000)us-gaap_AmortizationOfIntangibleAssets
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 900,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 500,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 326,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 36,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 19,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Trademarks [Member] |  |  |
Gross Carrying Amount [Roll Forward] |  |  |
Beg Bal Finite-Lived Intangible Assets, Gross | 1,230,000 us-gaap_FiniteLivedIntangibleAssetsGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Goodwill and Other Intangibles Impairment, gross | (1,010,000)nsp_GoodwillandOtherIntangiblesImpairmentgross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
End Bal Finite-Lived Intangible Assets, Gross | 220,000 us-gaap_FiniteLivedIntangibleAssetsGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Total gross carrying amount and aggregate goodwill acquired [Abstract] |  |  |
Goodwill and Other Intangibles Impairment, gross | (1,010,000)nsp_GoodwillandOtherIntangiblesImpairmentgross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Accumulated amortization [Abstract] |  |  |
Beg Bal Finite-Lived Intangible Assets, Accumulated Amortization | (680,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | 695,000 nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Amortization Expense | (77,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
End Bal Finite-Lived Intangible Assets, Accumulated Amortization | (62,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Total accumulated amortization and accumulated impairment [Abstract] |  |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | 695,000 nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Amortization Expense | (77,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |
Beg Bal Intangible Assets, Net (Excluding Goodwill) | 550,000 us-gaap_FiniteLivedIntangibleAssetsNet / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Impairment of Intangible Assets (Excluding Goodwill) | (315,000)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Amortization Expense | (77,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
End Bal Intangible Assets, Net (Excluding Goodwill) | 158,000 us-gaap_FiniteLivedIntangibleAssetsNet / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Amortization [Abstract] |  |  |
Amortization expense related to purchased intangible assets | (77,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_TrademarksMember |  |
Customer Relationships [Member] |  |  |
Gross Carrying Amount [Roll Forward] |  |  |
Beg Bal Finite-Lived Intangible Assets, Gross | 7,784,000 us-gaap_FiniteLivedIntangibleAssetsGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Goodwill and Other Intangibles Impairment, gross | (1,392,000)nsp_GoodwillandOtherIntangiblesImpairmentgross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
End Bal Finite-Lived Intangible Assets, Gross | 6,392,000 us-gaap_FiniteLivedIntangibleAssetsGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Total gross carrying amount and aggregate goodwill acquired [Abstract] |  |  |
Goodwill and Other Intangibles Impairment, gross | (1,392,000)nsp_GoodwillandOtherIntangiblesImpairmentgross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Accumulated amortization [Abstract] |  |  |
Beg Bal Finite-Lived Intangible Assets, Accumulated Amortization | (4,340,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | 976,000 nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Amortization Expense | (1,415,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
End Bal Finite-Lived Intangible Assets, Accumulated Amortization | (4,779,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Total accumulated amortization and accumulated impairment [Abstract] |  |  |
Adj to accumulated amortization and accumulated impairment for goodwill and other intangibles | 976,000 nsp_Adjtoaccumulatedamortizationandaccumulatedimpairmentforgoodwillandotherintangibles / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Amortization Expense | (1,415,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |
Beg Bal Intangible Assets, Net (Excluding Goodwill) | 3,444,000 us-gaap_FiniteLivedIntangibleAssetsNet / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Impairment of Intangible Assets (Excluding Goodwill) | (416,000)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Amortization Expense | (1,415,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
End Bal Intangible Assets, Net (Excluding Goodwill) | 1,613,000 us-gaap_FiniteLivedIntangibleAssetsNet / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Amortization [Abstract] |  |  |
Amortization expense related to purchased intangible assets | (1,415,000)us-gaap_AmortizationOfIntangibleAssets / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_CustomerRelationshipsMember |  |
Goodwill [Member] |  |  |
Aggregrate goodwill acquired [Roll Forward] |  |  |
Beg Bal Goodwill, Gross | 21,156,000 us-gaap_GoodwillGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
End Bal Goodwill, Gross | 21,156,000 us-gaap_GoodwillGross / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |
Beg Bal Goodwill, Impaired, Accumulated Impairment Loss | (6,716,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
Goodwill, Impairment Loss | (1,754,000)us-gaap_GoodwillImpairmentLoss / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
End Bal Goodwill, Impaired, Accumulated Impairment Loss | (8,470,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
Intangible Assets, Net (Including Goodwill) [Abstract] |  |  |
Beg Bal Goodwill, net balance | 14,440,000 us-gaap_Goodwill / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
Goodwill, Impairment Loss | (1,754,000)us-gaap_GoodwillImpairmentLoss / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |
End Bal Goodwill, net balance | $ 12,686,000 us-gaap_Goodwill / nsp_GoodwillandIntangibleAssetsTableGrossAANetAxis = us-gaap_GoodwillMember |  |

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- Definition Adjustment in the period to accumulated amortization and accumulated impairment related to impairments recognized for goodwill and other intangibles. + References No definition available. + Details
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- Definition Goodwill and Other Intangibles Impairment - The gross (before adjustment to accumulated amortization for amortizing intangibles) impairment of goodwill and other intangible assets recognized in the period, recorded as a reduction to the asset account. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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