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Stock Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonqualified options or restricted stock for key employees and independent directors (up to) (in shares)	500,000		500,000
Unrecognized compensation cost related to nonvested stock options granted	$ 0		$ 0
Shares, granted (in shares)			0	0.00
Compensation expense restricted stock awards	$ 277,000	$ 207,000	$ 951,000	$ 396,000
Vested (in shares)	300		40,405
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested restricted stock	$ 1,311,000		$ 1,311,000
Fair value of shares vesting during period	9,000	$ 6,000	$ 1,471,000	$ 923,000
Restricted Stock Units (RSUs) | Vested Immediately
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)			15,600
Compensation expense	$ 0		$ 385,000
Performance Based Restricted Stock Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, granted (in shares)			15,702		10,000
Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting per year			33.00%
Award vesting period			3 years
Starting period of vesting of stock based award			1 year
Aggregate percentage of stock based awards to be matured			100.00%
Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, vesting per year			25.00%
Award vesting period			4 years
Starting period of vesting of stock based award			1 year
Aggregate percentage of stock based awards to be matured			100.00%

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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