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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 26, 2014
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Aggregate amount of goodwill acquired | $ 241,100,000 | $ 241,100,000 | $ 237,300,000 |  |
Aggregate amount of impairment | 70,900,000 | 70,900,000 | 17,100,000 |  |
Goodwill, impairment charge |  | 53,762,000 |  |  |
Goodwill balance | 170,153,000 | $ 170,153,000 | 220,163,000 | $ 165,861,000 |
Additional impairment evaluation, description |  | A 1% increase in the selected discount rate would have resulted in zero, $0.4 million, and $2.8 million, of additional impairment for the SAT, Duall, and GPS reporting units, respectively. A 5% decrease in the selected multiples of revenue and EBITDA would have resulted in zero, $0.2 million, and $1.7 million, of additional impairment for the SAT, Duall, and GPS reporting units, respectively. |  |  |
Increase in discount rate |  | 1.00% |  |  |
Decrease in selected multiples of revenue and EBITDA |  | 5.00% |  |  |
Intangible assets – indefinite life | 22,042,000 | $ 22,042,000 | 26,337,000 | 19,766,000 |
Impairment of intangible assets |  | 4,161,000 | 3,340,000 |  |
Asset impairment charges |  | 0 |  |  |
Amortization expense of finite life intangible assets |  | 13,900,000 | $ 12,300,000 | $ 7,600,000 |
Amortization expense of finite life intangibles for 2017 | 11,500,000 | 11,500,000 |  |  |
Amortization expense of finite life intangibles for 2018 | 10,000,000 | 10,000,000 |  |  |
Amortization expense of finite life intangibles for 2019 | 8,800,000 | 8,800,000 |  |  |
Amortization expense of finite life intangibles for 2020 | 7,100,000 | 7,100,000 |  |  |
Amortization expense of finite life intangibles for 2021 | 5,800,000 | 5,800,000 |  |  |
Weighted average amortization period for finite lived assets acquired |  |  | 8 years 8 months 12 days | 9 years 10 months 24 days |
SAT Technology, Inc. ("SAT") [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Goodwill, impairment charge | 1,700,000 |  |  |  |
Goodwill balance | 0 | 0 |  |  |
Duall [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Goodwill, impairment charge | 5,100,000 |  |  |  |
Goodwill balance | 5,400,000 | 5,400,000 |  |  |
Global Pump Solutions (GPS) [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Goodwill, impairment charge | 46,900,000 |  |  |  |
Goodwill balance | 26,800,000 | 26,800,000 |  |  |
Three Reporting Units [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Goodwill, impairment charge |  |  | $ 0 | $ 0 |
Intangible assets – indefinite life | $ 16,500,000 | $ 16,500,000 |  |  |
Fair value lower than the aggregate carrying value | 25.20% | 25.20% |  |  |
Impairment of intangible assets |  | $ 4,200,000 | $ 3,300,000 | $ 0 |
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 balance | $ 59,860,000 | 59,860,000 |  |  |
Impairment of intangible assets |  | 1,600,000 |  |  |
SAT Technology, Inc. ("SAT") [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Goodwill balance |  |  |  |  | $ 1,733,000
Additional goodwill impairment loss |  | 0 |  |  |
Decrease in EBITDA results in additional impairment |  | 0 |  |  |
Impairment of intangible assets |  | 300,000 |  |  |
Duall [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Additional goodwill impairment loss |  | 400,000 |  |  |
Decrease in EBITDA results in additional impairment |  | 200,000 |  |  |
Impairment of intangible assets |  | 500,000 |  |  |
Global Pump Solutions (GPS) [Member] |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |
Additional goodwill impairment loss |  | 2,800,000 |  |  |
Decrease in EBITDA results in additional impairment |  | 1,700,000 |  |  |
Impairment of intangible assets |  | $ 1,800,000 |  |  |

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