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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Non-Printing) (Detail) - shares shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Share Based Awards
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive restricted share awards excluded from computation of diluted EPS (in shares)	0.8	0.9

X

- Definition

Dilutive securities excluded from computation of earnings per share, amount.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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