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Detail of Certain Balance Sheet Accounts - Current and Long-Term Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract] |  |
Balance at beginning of year | $ 5,215 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 5,447 us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to bad debt expense and provision for long-term contract receivable | 103,871 pwr_ProvisionForDoubtfulAccountsChargedToExpense | 3,236 pwr_ProvisionForDoubtfulAccountsChargedToExpense
Deductions for uncollectible receivables written off, net of recoveries | (102,912)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (3,468)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of year | $ 6,174 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 5,215 us-gaap_AllowanceForDoubtfulAccountsReceivable

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- Definition Provision For Doubtful Accounts Charged To Expense + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 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 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755819&loc=SL9156395-115594 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration