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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,188	$ 1,510	$ 2,545	$ 2,995
Unamortized Stock-Based Compensation	6,137	12,339	6,137	12,339
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	702	981	$ 1,478	$ 1,669
Remaining Weighted Average Period (years)			2 years 2 months 12 days	2 years 2 months 12 days
Unamortized Stock-Based Compensation	3,861	8,091	$ 3,861	$ 8,091
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	118	99	$ 241	$ 195
Remaining Weighted Average Period (years)			10 months 24 days	10 months 24 days
Unamortized Stock-Based Compensation	403	385	$ 403	$ 385
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	368	430	$ 826	$ 1,131
Remaining Weighted Average Period (years)			2 years 2 months 12 days	2 years 2 months 12 days
Unamortized Stock-Based Compensation	$ 1,873	$ 3,863	$ 1,873	$ 3,863

X

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for share-based payment arrangement.

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