Pension Plan - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended		12 Months Ended
	May 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan					$ 0		$ 0
Defined benefit plan pension obligation retirement benefit percentage							53.00%
Defined benefit plan pension obligation, loss on settlement							$ 1,546,000
Net periodic benefit costs, total		$ 19,000		$ 56,000	$ 942,000	$ 111,000
Orange pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension merger expense			$ 900,000
Defined Benefit Plan, Benefit Obligation, Business Combination	$ 2,740,000
Defined Benefit Plan, Plan Assets, Business Combination	$ 1,829,000