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Net Income Per Share (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 8,164 us-gaap_NetIncomeLoss | $ 8,385 us-gaap_NetIncomeLoss | $ 1,891 us-gaap_NetIncomeLoss | $ 9,564 us-gaap_NetIncomeLoss | $ 5,289 us-gaap_NetIncomeLoss | [1] | $ 10,082 us-gaap_NetIncomeLoss | $ 3,488 us-gaap_NetIncomeLoss | [2] | $ 13,173 us-gaap_NetIncomeLoss | $ 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
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  | 24,708 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,850 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,007 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed conversions of common stock options |  |  |  |  |  |  |  |  |  |  | 4 nsp_IncrementalSharesFromAssumedConversionsOfCommonStockOptions | 22 nsp_IncrementalSharesFromAssumedConversionsOfCommonStockOptions | 60 nsp_IncrementalSharesFromAssumedConversionsOfCommonStockOptions
Adjusted weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  | 24,712 nsp_AdjustedWeightedAverageCommonSharesOutstanding | 24,872 nsp_AdjustedWeightedAverageCommonSharesOutstanding | 25,067 nsp_AdjustedWeightedAverageCommonSharesOutstanding
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect |  |  |  |  |  |  |  |  |  |  | 4 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 29 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] | Includes a $2.0 million tax benefit related to tax years 2009 through 2012. Please read Note 9 to the Consolidated Financial Statements, “Income Taxes,” for additional information.
[2] | Includes a non-cash impairment charge in the second quarter of 2013 of $2.7 million. Please read Note 6 to the Consolidated Financial Statements, “Other Assets,” for additional information.

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