XML 43 R45.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue From Contracts With Customers - Backlog By Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Backlog | $ 1,190,120 | $ 1,068,025
Heavy Civil |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | 886,575 | 834,049
Specialty Services |  |
Disaggregation of Revenue [Line Items] |  |
Backlog | $ 303,545 | $ 233,976

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

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=strl_HeavyCivilConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=strl_SpecialtyServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |