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Accounting Policies Schedule of Significant Markets (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Markets [Line Items]
Percentage of revenues from the Company Texas markets	26.00%	26.00%	27.00%
Percentage of revenues from the Company California markets	17.00%	17.00%	16.00%
Percent of Revenue from Company New York Markets	10.00%	9.00%	9.00%
Percentage of Revenue from Company Other Markets	47.00%	48.00%	48.00%

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- Definition

A presentation of the revenue percentage from all other states not individually presented.

+ References

No definition available.

+ Details

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- Definition

A presentation of the revenue percentage from the state of California.

+ References

No definition available.

+ Details

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Namespace Prefix:	nsp_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

A presentation of the revenue percentage from the state of Texas.

+ References

No definition available.

+ Details

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Namespace Prefix:	nsp_
Data Type:	num:percentItemType
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- Definition

A presentation of the revenue percentage from the state of New York.

+ References

No definition available.

+ Details

Name:	nsp_PercentofRevenuefromCompanyNewYorkMarkets
Namespace Prefix:	nsp_
Data Type:	num:percentItemType
Balance Type:	na
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- Details

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