Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Summary of Net Change in Carrying Value of Assets Held in Rabbi Trust and Deferred Compensation Liability (Detail)

v3.19.1
Selected Balance Sheet Data - Summary of Net Change in Carrying Value of Assets Held in Rabbi Trust and Deferred Compensation Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Increase in the carrying value of the assets held in the rabbi trust $ 703 $ 14
Increase in the net carrying value of the deferred compensation obligation $ 685 $ 0