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Earnings Per Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Excluded common stock for computation of diluted earnings per share	2.2	1.9	1.4
Restricted Stock [Member]
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Excluded common stock for computation of diluted earnings per share		0.1

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- Definition

Schedule of computation of basic and diluted earnings per common share.

+ References

No definition available.

+ Details

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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