Income Taxes - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Other deferred tax assets, net	$ 25,500,000	$ 32,400,000
Parent Company [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance related to the portion of operating loss carryforwards	$ 8,100,000
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax years open for examination	2015
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Tax years open for examination	2018
Le Mars [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance related to the portion of operating loss carryforwards	$ 264,467
Operating loss carryforwards	$ 1,200,000
Operating loss carryforwards expiration period	2020
Operating loss carryforwards annual limitations in amount on use	$ 376,000