Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Goodwill [Line Items] | |||||
| Goodwill, Beginning Balance | $ 72,074 | $ 64,300 | |||
| Acquisitions | [1] | 100 | 7,800 | ||
| Impairments | $ (10,700) | (10,702) | |||
| Goodwill, Ending Balance | $ 61,508 | $ 61,508 | $ 72,074 | ||
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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