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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Parenthetical)(Detail) - TRS [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Income Tax Expense Benefit [Line Items]
Net operating loss carryforwards	$ 24.9
Expiry of net operating loss carryforwards	2022 through 2035

X

- Definition

Income tax expense benefit.

+ References

No definition available.

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X

- Definition

Operating loss carry forward expiration date.

+ References

No definition available.

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X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

+ References

No definition available.

+ Details

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X

- Details

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