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Valuation and Qualifying Accounts (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Uncollectible Trade Accounts [Member] |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Year |  | $ 5,996,000 | $ 3,463,000 | $ 2,906,000
Charged to Costs & Expenses |  | 54,000 | 457,000 | 46,000
Charged to Other Accounts | [1] | 680,000 | 2,079,000 | (13,000)
Deductions | [2] | (2,000) | (3,000) | 524,000
Balance at End of Year |  | 6,728,000 | 5,996,000 | 3,463,000
Deferred tax valuation allowance [Member] |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Year |  | 1,681,000 | 456,000 | 108,000
Charged to Costs & Expenses |  | 1,447,000 | 1,225,000 | 348,000
Balance at End of Year |  | $ 3,128,000 | $ 1,681,000 | $ 456,000
[1] | Expected customer account adjustments charged to revenue and write-offs, net of recoveries
[2] | Represents bad debt recoveries

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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