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Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deposits [Abstract] |  |
Prepaid health insurance | $ 9,000 | $ 9,000
Deposits – health insurance | 5,300 | 4,700
Deposits – workers’ compensation | $ 154,215 | $ 143,938

X
- Definition Carrying value of amounts transferred to third party health care providers for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + References No definition available. + Details
Name: | nsp_DepositsHealthInsurance
Namespace Prefix: | nsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying value of amounts transferred to third party workers' compensation insurance providers for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + References No definition available. + Details
Name: | nsp_DepositsWorkersCompensation
Namespace Prefix: | nsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date for portion of health insurance contract to be utilized over longer than one year. + References No definition available. + Details
Name: | nsp_PrepaidHealthInsurance
Namespace Prefix: | nsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration