XML 56 R45.htm IDEA: XBRL DOCUMENT v3.20.2

Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Contract revenues	$ 513,051	$ 448,776	$ 1,031,521	$ 916,870
Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 513,051	$ 448,776	$ 1,031,521	$ 916,870
Concentration risk	100.00%	100.00%	100.00%	100.00%
Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 314,012	$ 234,689	$ 653,553	$ 501,724
Concentration risk	61.20%	52.30%	63.40%	54.70%
Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 103,676	$ 65,017	$ 185,062	$ 126,199
Concentration risk	20.20%	14.50%	17.90%	13.80%
TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 83,384	$ 114,034	$ 167,237	$ 202,873
Concentration risk	16.30%	25.40%	16.20%	22.10%
Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 11,979	$ 35,036	$ 25,669	$ 86,074
Concentration risk	2.30%	7.80%	2.50%	9.40%
T&D [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 276,759	$ 255,910	$ 536,029	$ 528,458
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 126,350	$ 119,572	$ 247,352	$ 252,896
Concentration risk	45.70%	46.70%	46.10%	47.90%
T&D [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 84,629	$ 52,162	$ 147,939	$ 103,356
Concentration risk	30.60%	20.40%	27.60%	19.60%
T&D [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 61,632	$ 76,841	$ 129,683	$ 153,149
Concentration risk	22.30%	30.00%	24.20%	29.00%
T&D [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 4,148	$ 7,335	$ 11,055	$ 19,057
Concentration risk	1.40%	2.90%	2.10%	3.50%
C&I [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 236,292	$ 192,866	$ 495,492	$ 388,412
Concentration risk	100.00%	100.00%	100.00%	100.00%
C&I [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 187,662	$ 115,117	$ 406,201	$ 248,828
Concentration risk	79.40%	59.70%	82.00%	64.10%
C&I [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 19,047	$ 12,855	$ 37,123	$ 22,843
Concentration risk	8.10%	6.70%	7.50%	5.90%
C&I [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 21,752	$ 37,193	$ 37,554	$ 49,724
Concentration risk	9.20%	19.30%	7.60%	12.80%
C&I [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 7,831	$ 27,701	$ 14,614	$ 67,017
Concentration risk	3.30%	14.30%	2.90%	17.20%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_FixedPriceContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerBasisOfPricingAxis=myrg_UnitPriceContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerBasisOfPricingAxis=myrg_TeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerBasisOfPricingAxis=us-gaap_OtherContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=myrg_TransmissionAndDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=myrg_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: