XML 97 R92.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note 20 - Quarterly Financial Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |
Charges to Estimated Revenues | $ 9.5 strl_ChargesToEstimatedRevenues | $ 4.5 strl_ChargesToEstimatedRevenues | $ 37.7 strl_ChargesToEstimatedRevenues | $ 20.6 strl_ChargesToEstimatedRevenues | $ 4.3 strl_ChargesToEstimatedRevenues
Valuation Allowances and Reserves, Adjustments |  |  | $ 28.2 us-gaap_ValuationAllowancesAndReservesAdjustments |  |

X
- Definition Charges to Estimated Revenues + References No definition available. + Details
Name: | strl_ChargesToEstimatedRevenues
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
Name: | us-gaap_ValuationAllowancesAndReservesAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration