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Basis of Presentation and New Accounting Pronouncements (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2017
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 196,616,000 |  | $ 185,058,000 |
Aggregate amount of transaction price allocated to material rights that remain unsatisfied | $ 3,426,000 |  |  |
Revenue expected to be recognized in next 12 months | 55.00% |  |  |
Revenue expected to be recognized in 2019 | 29.00% |  |  |
Revenue expected to be recognized in 2020 | 10.00% |  |  |
Revenue expected to be recognized in 2021 | 5.00% |  |  |
Revenue expected to be recognized in 2022 | 1.00% |  |  |
Unearned revenue | $ 6,800,000 |  | 4,889,000 | $ 4,889,000
Cash from or used in operating activities | 5,590,000 | $ (21,336,000) |  |
Cash from or used in investing activities | (8,393,000) | (15,552,000) |  |
Cash from or used in financing activities | (35,400,000) | $ (8,472,000) |  |
Income tax effects from Tax Act | 0 |  | 20,153,000 |
ASU 2018-02 |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Adjustment against retained earnings for effect of change in federal corporate income tax rate | 40,000 |  |  |
Adjustments related to valuation allowance | 0 |  |  |
Income tax effects from Tax Act | 0 |  |  |
ASU 2014-09 |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Cash from or used in operating activities | 0 |  |  |
Cash from or used in investing activities | 0 |  |  |
Cash from or used in financing activities | 0 |  |  |
ASU 2016-16 |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Favourable adjustment to retained earnings | $ 31,645,000 |  |  |
Minimum |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Payment terms of contracts | 30 days |  |  |
Maximum |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Payment terms of contracts | 120 days |  |  |
Industrial Segments |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |
Unearned revenue | $ 3,374,000 |  | $ 4,889,000 |

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