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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Parenthetical)(Detail) - TRS [Member] $ in Millions | 12 Months Ended
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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

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