Pension Plan - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan pension obligation retirement benefit percentage				53.00%
Defined benefit plan pension obligation, loss on settlement			$ 2,673,000	$ 1,546,000
Net periodic benefit costs, total	$ 19,000	$ 942,000