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Recent Accounting Pronouncements - Additional Information (Detail)	6 Months Ended
	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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Balance Type:	debit
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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