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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense Benefit [Line Items] |  |  |
Other | $ (8,409) | $ 2,625 | $ 10,204
Total expense | $ 459 | $ 17 | $ 0
TRS [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Statutory Rate | 34.00% | 34.00% | 34.00%
Statutory rate applied to pre-tax income | $ 3,801 | $ 3,384 | $ (492)
State tax expense net of federal income tax | 254 | 498 | (72)
State deferred tax expense net of federal income tax | 724 | 0 | 0
Permanent items | (241) | 0 | 0
Deferred tax impact of federal rate change | 19,391 | 0 | 0
Valuation allowance decrease based on impact of federal rate change | (23,470) | (4,039) | (1,169)
Other | 0 | 174 | 1,733
Total expense | $ 459 | $ 17 | $ 0
Effective tax rate | 4.11% | 0.17% | 0.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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