Share-based Compensation - Additional Information (Detail) - shares	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares issued under stock purchase plan, stock option exercises and restricted stock awards and units	72,281	58,357	317,536	244,801

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