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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - TRS [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense Benefit [Line Items]
Deferred tax assets	$ 37,940	$ 61,742
Deferred tax liabilities	(72)	(404)
Valuation allowance	(37,868)	(61,338)
Net deferred tax asset	$ 0	$ 0

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- Definition

Income tax expense benefit.

+ References

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(15)(b)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-SubTopic 210
-Section S99
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-Section S99
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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