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Basis of Presentation and New Accounting Pronouncements (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Basis Of Presentation And Accounting Policies [Line Items] |  |
Accounts receivable, net of allowance for doubtful accounts | $ 200,024,000 | $ 185,058,000
Aggregate amount of transaction price allocated to material rights that remain unsatisfied | $ 2,681,000 |
Revenue expected to be recognized in next 12 months | 33.00% |
Revenue expected to be recognized in 2019 | 52.00% |
Revenue expected to be recognized in 2020 | 11.00% |
Revenue expected to be recognized in 2021 | 4.00% |
Unearned revenue | $ 5,768,000 | 4,889,000
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 | $ 3,087,000 | $ 4,889,000

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 + Details
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