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Recent Accounting Pronouncements - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018 USD ($)
New Accounting Pronouncements And Changes In Accounting Principles [Abstract] |
Deferred tax benefit or expense related to remeasurement of deferred tax assets and liabilities | $ 0

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- Definition Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit). + References No definition available. + Details
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- References No definition available. + Details
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