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Office Closing and Exit Costs - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Termination costs | $ (279,000) | $ (47,000) | $ (96,000) | $ 4,192,000 | $ (822,000) | $ 136,000 | $ 5,000 | $ 162,000 | $ 8,400,000 | $ 3,770,000 | $ (519,000) | $ 15,070,000
Stock-based compensation expense (gain) |  |  |  |  |  |  |  |  |  | 1,664,000 | 0 | 217,000
Building lease |  |  |  |  |  |  |  |  |  | (70,000) | 303,000 | 3,147,000
Accrued severance costs |  |  |  |  |  |  |  |  |  | $ 2,176,000 | (822,000) | 11,706,000
MRD |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Termination costs |  |  |  |  |  |  |  |  |  |  | 0 |
Office closing costs |  |  |  |  |  |  |  |  |  |  | $ 0 |
Oklahoma City Restructuring |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional accruals for severance costs |  |  |  |  |  |  |  |  |  |  |  | 275,000
Stock-based compensation expense (gain) |  |  |  |  |  |  |  |  |  |  |  | 948,000
Virginia and West Virginia Properties and Other |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional accruals for severance costs |  |  |  |  |  |  |  |  |  |  |  | 11,400,000
Stock-based compensation expense (gain) |  |  |  |  |  |  |  |  |  |  |  | $ (731,000)

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees as it relates to exit or disposal activities pursuant to an authorized plan. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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