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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 09, 2013 USD ($) | Dec. 31, 2014 USD ($) Customer | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) Customer km | Jun. 30, 2014 USD ($) Customer | Jun. 30, 2015 USD ($) Customer Agency km | Jun. 30, 2014 USD ($) Customer | Dec. 31, 2014 USD ($) Customer | Jul. 31, 2014 USD ($) | Dec. 31, 2011 USD ($) | Apr. 21, 2010 mi
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  |  | $ 8,700,000 |  |  |  |  |
Rent expense related to operating leases |  |  |  | $ 50,900,000 | $ 42,600,000 | 100,200,000 | $ 77,200,000 |  |  |  |
Maximum guaranteed residual value |  |  |  | $ 469,400,000 |  | $ 469,400,000 |  |  |  |  |
Number of customers representing ten percent or more of consolidated revenues | Customer |  |  |  | 0 | 0 | 0 | 0 |  |  |  |
Number of customers representing ten percent or more of net position | Customer |  | 0 |  | 0 |  | 0 |  | 0 |  |  |
Gross amount accrued for insurance claims |  | $ 170,200,000 |  | $ 177,000,000 |  | $ 177,000,000 |  | $ 170,200,000 |  |  |
Long-term insurance claims |  | 130,800,000 |  | 144,100,000 |  | 144,100,000 |  | 130,800,000 |  |  |
Related insurance recoveries/receivables |  | 9,100,000 |  | 10,100,000 |  | 10,100,000 |  | 9,100,000 |  |  |
Related insurance recoveries/receivables included in prepaid expenses and other current assets |  | 800,000 |  | 500,000 |  | 500,000 |  | 800,000 |  |  |
Related insurance recoveries/receivables included in other assets net |  | 8,300,000 |  | 9,600,000 |  | 9,600,000 |  | $ 8,300,000 |  |  |
Letters of credit and bank guarantees under the credit facility |  |  |  | 324,700,000 |  | 324,700,000 |  |  |  |  |
Total amount of outstanding performance bonds |  |  |  | 2,700,000,000 |  | 2,700,000,000 |  |  |  |  |
Estimated cost to complete bonded projects |  |  |  | 744,000,000 |  | 744,000,000 |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  |  |  |  |  |  |  | $ 39,600,000 | $ 32,600,000 |
Multi-employer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company | $ 6,900,000 |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation complete withdrawal | 4,800,000 |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation accrued |  |  |  |  |  | 2,600,000 |  |  |  |  |
Cash proceeds deposited in Escrow account | $ 2,100,000 |  |  |  |  |  |  |  |  |  |
Pre-acquisition non-U.S.tax obligations and indemnification asset amount recorded |  |  |  | 11,400,000 |  | 11,400,000 |  |  |  |  |
Pre-acquisition non-U.S.tax obligations and indemnification liability amount recorded |  |  |  | $ 11,400,000 |  | $ 11,400,000 |  |  |  |  |
Alberta Power Line [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract | km |  |  |  | 500 |  | 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 |  |  |  |  |  |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  | $ 200,000 |  |  |  |  |  |  |  |
June 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  |  | $ 8,500,000 |  |  |  |  |
Vehicle Fleet Committed Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated committed capital remainder of current year |  |  |  | $ 6,300,000 |  | 6,300,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  |  | $ 40,100,000 |  | $ 40,100,000 |  |  |  |  |
Minimum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 10.00% | 10.00% | 10.00% | 10.00% |  |  |  |
Minimum [Member] | Net Position [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% |  | 10.00% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  |  | $ 55,400,000 |  | $ 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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