Share-based Compensation - Additional Information (Detail) - shares	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares issued under stock purchase plan, stock option exercises and restricted stock awards and units	58,357	43,603	244,801	295,496

Stock shares issued net of shares for tax withholdings.

No definition available.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration