Share-based Compensation - Additional Information (Detail) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares issued under stock purchase plan, stock option exercises and restricted stock	80,444	76,596	206,955	291,275

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