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Debt Obligations - Debt Obligations (Parenthetical) (Detail) | Dec. 31, 2013 | Dec. 31, 2012
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Minimum [Member] |  |
Debt Obligations [Line Items] |  |
Annual Interest Rate | 6.00% | 6.00%
Maximum [Member] |  |
Debt Obligations [Line Items] |  |
Annual Interest Rate | 7.30% | 7.30%

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- Details
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Namespace Prefix: | pwr_
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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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