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Significant Accounting Policies and Practices (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Principles of Consolidation
Restricted Cash and Cash Equivalents	$ 1,192		$ 465
Financial Instruments, Owned, at Fair Value [Abstract]
Book overdrafts	29,075stan_BookOverdrafts		30,782stan_BookOverdrafts
Equity investment in unconsolidated subsidiaries.
Equity earnings in related investments	$ 404	$ 450
Minimum
Equity investment in unconsolidated subsidiaries.
Voting interest ownership percentage	30.00%
Maximum
Equity investment in unconsolidated subsidiaries.
Voting interest ownership percentage	50.00%

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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