XML 60 R43.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies (Principles of Consolidation) - Additional Information (Detail) | Dec. 31, 2016
--- | ---
Minimum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Equity method investment ownership | 20.00%
Maximum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Equity method investment ownership | 50.00%

X
- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | pwr_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | pwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |