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Deposits (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deposits [Abstract]
Prepaid health insurance	$ 9,000	$ 9,000
Deposits – health insurance	3,700	3,000
Deposits – workers’ compensation	$ 81,878	$ 64,201

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

- Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration