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Employee Benefit Plans - Summary of Plan Information Relating to Participation in Multiemployer Pension Plans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 110,082 | $ 85,235 | $ 77,015
National Electrical Benefit Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 29,161 | 22,912 | 21,200
Pipeline Industry Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 13,585 | 6,954 | 6,087
Central Pension Fund of the IUOE & Participating Employers |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 12,176 | 5,668 | 5,677
Teamsters National Pipe Line Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 3,602 | 1,661 | 1,343
Laborers Pension Trust Fund for Northern California |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 3,387 | 3,805 | 2,603
Eighth District Electrical Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 3,208 | 3,089 | 2,544
Laborers National Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 3,049 | 1,358 | 7,671
Alaska Electrical Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 2,143 | 2,701 | 639
Operating Engineers Local 324 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 1,969 | 1,291 | 1,231
OE Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 1,703 | 1,508 | 1,264
Plumbers and Pipefitters National Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 1,273 | 1,666 | 850
Alaska Laborers - Employers Retirement Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 536 | 1,216 | 181
Laborers District Council of W PA Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 418 | 876 | 21
Alaska Teamster Employer Pension Plan |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 255 | 659 | 513
Midwest Operating Engineers Pension Trust Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 106 | 793 | 3,294
All other plans, US |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 24,234 | 28,516 | 20,594
All other plans, Canada |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 9,277 | $ 562 | $ 1,303

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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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