Debt (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Debt Related Commitment Fees and Debt Issuance Costs	$ 6.4
Percentage Of Line Of Credit Facility Current Borrowing Capacity On Ebitda	20.00%
Line of Credit Facility, Maximum Borrowing Capacity	$ 5.0
Line of Credit Facility, Current Borrowing Capacity	$ 2.5
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Base Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate During Period	9.00%	10.30%
Debt Instrument, Description of Variable Rate Basis	(a) the base commercial lending rate of the Collateral Agent as publicly announced to be in effect from time to time, as adjusted by the Collateral Agent; (b) the sum of 0.50% per annum and the Federal Funds Rate (as defined in the Credit Agreement); (c) the daily one month LIBOR as published each business day in The Wall Street Journal for a one month period divided by a number equal to 1.00 minus the Reserve Percentage (as defined in the Credit Agreement) plus 100 basis points, as of such day and; (d) 2.00%.
Debt Instrument, Interest Rate, Basis for Effective Rate	6.80% plus the Base Rate
Eurodollar [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Description of Variable Rate Basis	(a) the amount calculated by dividing (x) the rate which appears on the Bloomberg Page BBAM1, or the rate which is quoted by another authorized source, two business days prior to the commencement of any interest period as the LIBOR for such an amount by (y) a number equal to 1.00 minus the Reserve Percentage (as defined in the Credit Agreement) and; (b) 1.00%.
Debt Instrument, Interest Rate, Basis for Effective Rate	7.80% plus the Eurodollar Rate
Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument Quarterly Installments Percentage of Principal Amount	0.625%
Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument Quarterly Installments Percentage of Principal Amount	2.50%
Loans Payable [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 81.8
Debt Instrument, Maturity Date	Nov. 23, 2020
Long-term Line of Credit	$ 15.0	$ 15.0
Line of Credit Facility, Description	Advances under the revolving line-of-credit are limited by a borrowing base which may not exceed the lesser of (x) the difference between $15 million and amounts outstanding under letters of credit issued pursuant to the Credit Agreement; and (y) an amount equal to the sum of: (i) up to 85% of certain accounts receivable of the Company plus (ii) up to 100% of unrestricted cash on deposit in the Company’s accounts with the Collateral Agent, minus (iii) amounts outstanding under letters of credit issued pursuant to the Credit Agreement, minus (iv) reserves established by the Collateral Agent from time to time in its reasonable credit judgment exercised in good faith.
Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 15.0
Uncommitted Accordion Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 90.0

Debt quarterly installments as a percentage of principal amount.

No definition available.

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Namespace Prefix:	stgg_
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Balance Type:	na
Period Type:	duration

- Definition

This element represents the percentage of current borrowing capacity of line of credit facility on EBITDA.

+ References

No definition available.

+ Details

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Namespace Prefix:	stgg_
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Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of any adjustments made to the stated rate to determine the effective rate.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
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Period Type:	duration

- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Period Type:	instant

- Definition

Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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