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Commitments and Contingencies - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Oct. 09, 2013 USD ($) | Jan. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Customer Agency km | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 USD ($) Customer | Jul. 31, 2014 USD ($) | Apr. 21, 2010 mi
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  |  | $ 7,400,000 |  |  |  |
Rent expense related to operating leases |  |  |  |  |  | 208,500,000 | $ 161,500,000 | $ 111,800,000 |  |
Maximum guaranteed residual value |  |  |  |  |  | $ 487,100,000 |  |  |  |
Number of customers representing ten percent or more of consolidated revenues | Customer |  |  |  |  |  | 0 | 0 | 0 |  |
Number of customers representing ten percent or more of net position | Customer |  |  |  |  |  | 1 |  |  |  |
Gross amount accrued for insurance claims |  |  |  | $ 170,200,000 |  | $ 209,000,000 | $ 170,200,000 |  |  |
Long-term insurance claims |  |  |  | 130,800,000 |  | 153,500,000 | 130,800,000 |  |  |
Related insurance recoveries/receivables |  |  |  | 9,100,000 |  | 8,600,000 | 9,100,000 |  |  |
Related insurance recoveries/receivables included in prepaid expenses and other current assets |  |  |  | 800,000 |  | 600,000 | 800,000 |  |  |
Related insurance recoveries/receivables included in other assets net |  |  |  | 8,300,000 |  | 8,000,000 | $ 8,300,000 |  |  |
Letters of credit and bank guarantees under the credit facility |  |  |  |  |  | 307,000,000 |  |  |  |
Total amount of outstanding performance bonds |  |  |  |  |  | 2,600,000,000 |  |  |  |
Estimated cost to complete bonded projects |  |  |  |  |  | 906,000,000 |  |  |  |
Multiemployer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company |  | $ 6,900,000 |  |  |  |  |  |  |  |
Multiemployer plan withdrawal obligation complete withdrawal |  | 4,800,000 |  |  |  |  |  |  |  |
Multiemployer plan withdrawal obligation accrued |  |  |  |  |  | 2,100,000 |  |  |  |
Cash proceeds deposited in Escrow account |  | $ 2,100,000 |  |  |  |  |  |  |  |
Pre-acquisition non-U.S.tax obligations and indemnification asset amount recorded |  |  |  |  |  | 11,400,000 |  |  |  |
Pre-acquisition non-U.S.tax obligations and indemnification liability amount recorded |  |  |  |  |  | $ 11,400,000 |  |  |  |
Subsequent Event [Member] | 2013 Central States Plan [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of withdrawal liability | $ 4,800,000 |  | $ 4,800,000 |  |  |  |  |  |  |
Payment of withdrawal liability amount | 2,700,000 |  |  |  |  |  |  |  |  |
Alberta Power Line [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract | km |  |  |  |  |  | 500 |  |  |  |
Sunrise Powerlink Project [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract | mi |  |  |  |  |  |  |  |  |  | 117
Proceeds from customers |  |  |  | $ 65,000,000 |  |  |  |  |  |
Net Position [Member] | Customer Concentration Risk [Member] | Quanta's Electric Power Infrastructure Services Segment [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 12.00% |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  | $ 1,300,000 |  |  |  |  |
June 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  |  | $ 6,100,000 |  |  |  |
Vehicle Fleet Committed Capital [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated committed capital in next fiscal year |  |  |  |  |  | $ 2,300,000 |  |  |  |
Central States Plan [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of withdrawal liability |  |  |  |  |  |  |  |  | $ 39,600,000 |
Central States Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of withdrawal liability | $ 32,900,000 |  | 32,900,000 |  |  |  |  |  |  |
Payment of withdrawal liability amount |  |  | $ 11,000,000 |  |  |  |  |  |  |
Minimum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% | 10.00% | 10.00% |  |
Minimum [Member] | Net Position [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% | 10.00% |  |  |
Minimum [Member] | Central States Plan [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of withdrawal liability |  |  |  |  |  | $ 40,100,000 |  |  |  |
Maximum [Member] | Central States Plan [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of withdrawal liability |  |  |  |  |  | $ 55,400,000 |  |  |  |
Lorenzo Benton v Telecom Network Specialists Inc [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of staffing Agency | Agency |  |  |  |  |  | 29 |  |  |  |
Lorenzo Benton v Telecom Network Specialists Inc [Member] | Class Damage [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount sought by plaintiff |  |  |  |  |  | $ 16,000,000 |  |  |  |
Lorenzo Benton v Telecom Network Specialists Inc [Member] | Attorney Fees [Member] |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount sought by plaintiff |  |  |  |  |  | $ 5,000,000 |  |  |  |

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