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Goodwill and Intangible Assets - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Unit | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Aggregate amount of goodwill acquired | $ 242,300,000 | $ 242,300,000 | $ 241,100,000 |
Aggregate amount of impairment | 75,300,000 | 75,300,000 | 70,900,000 |
Goodwill, impairment charge |  | $ 4,443,000 | 53,762,000 |
Number of reporting units | Unit |  | 3 |  |
Goodwill | 166,951,000 | $ 166,951,000 | 170,153,000 | $ 220,163,000
Intangible assets – indefinite life | 19,691,000 | 19,691,000 | 22,042,000 | 26,337,000
Impairment of intangible assets |  | 2,725,000 | 4,161,000 |
Asset impairment charges |  | 0 |  |
Amortization expense of finite life intangible assets |  | 11,500,000 | 13,900,000 | $ 12,300,000
Amortization expense of finite life intangibles for 2018 | 10,100,000 | 10,100,000 |  |
Amortization expense of finite life intangibles for 2019 | 8,900,000 | 8,900,000 |  |
Amortization expense of finite life intangibles for 2020 | 7,200,000 | 7,200,000 |  |
Amortization expense of finite life intangibles for 2021 | 5,900,000 | 5,900,000 |  |
Amortization expense of finite life intangibles for 2022 | 4,900,000 | 4,900,000 |  |
Weighted average amortization period for finite lived assets acquired |  |  |  | 8 years 8 months 12 days
Zhongli, Inc. [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets |  | 900,000 |  |
Unit Four [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets |  | 500,000 |  |
Unit Three [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets |  | 300,000 |  |
Energy Segment [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, impairment charge | 4,400,000 | 4,443,000 |  |
Goodwill | 72,625,000 | 72,625,000 | 75,827,000 | $ 72,075,000
Environmental Segment [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, impairment charge |  |  | 6,828,000 |
Goodwill | 48,203,000 | 48,203,000 | 48,203,000 | 55,031,000
Four Reporting Units [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, impairment charge |  |  | 53,800,000 |
Intangible assets – indefinite life | $ 13,100,000 | $ 13,100,000 |  |
Fair value lower than the aggregate carrying value | 20.70% | 20.70% |  |
Impairment of intangible assets |  |  | 4,200,000 |
Three Reporting Units [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, impairment charge |  |  |  | 0
Impairment of intangible assets |  | $ 2,700,000 |  | $ 3,300,000
PMFG, Inc. [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Decrease in property and equipment |  |  | 5,500,000 |
Decrease in current assets |  |  | 1,700,000 |
Decrease in deferred income tax liability |  |  | 1,100,000 |
Decrease in noncontrolling interest |  |  | 1,800,000 |
Goodwill |  |  | $ 59,860,000 |
Unit One [Member] | Environmental Segment [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 32,400,000 | $ 32,400,000 |  |
Percentage of fair value exceeding carrying value of goodwill |  | 6.00% |  |
Decrease in projected revenue growth rates |  | 0.11% |  |
Decrease in projected operational profit growth rates |  | 0.65% |  |
Unit Two [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Impairment of intangible assets |  | $ 1,000,000 |  |
Unit Two [Member] | Energy Segment [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | 59,900,000 | $ 59,900,000 |  |
Percentage of fair value exceeding carrying value of goodwill |  | 3.00% |  |
Decrease in projected revenue growth rates |  | 0.04% |  |
Decrease in projected operational profit growth rates |  | 0.16% |  |
Unit Three [Member] | Energy Segment [Member] |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 5,700,000 | $ 5,700,000 |  |
Percentage of fair value exceeding carrying value of goodwill |  | 2.00% |  |
Decrease in projected revenue growth rates |  | 0.01% |  |
Decrease in projected operational profit growth rates |  | 0.20% |  |

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