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Share based compensation arrangement by share based payment award discount on market price of common stock percentage.

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Share based payment award equity instruments other than options grants in period aggregate intrinsic value.

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Share based compensation arrangement by share based payment award maximum employee subscription value

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- Definition

Share-based compensation arrangement by share-based payment award maximum percentage of earnings on employee base salaries.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount of cost capitalized for award under share-based payment arrangement.

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- Definition

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

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- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)		3 Months Ended
	Apr. 20, 2016	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 1,761,000	$ 1,679,000
Stock-based compensation, capitalized		95,000	113,000
Unrecognized compensation costs for all share-based payment arrangements		4,747,000
Accrued liabilities		30,356,000			$ 31,907,000
Other non-current liabilities		$ 14,016,000			$ 14,094,000
Common stock, shares issued		79,439,807			78,183,806
Time-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 0	0
Unrecognized compensation costs for all share-based payment arrangements			$ 0
Intrinsic value of SARs		$ 176,000
Number of shares, granted		0	0
Performance-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 0	$ 0
Unrecognized compensation costs for all share-based payment arrangements		0
Intrinsic value of SARs		$ 85,000
Number of shares, granted		0	0
Time-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 793,000	$ 830,000
Unrecognized compensation costs for all share-based payment arrangements		$ 2,646,000
Number of shares, granted		97,302
Performance-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 753,000	764,000
Unrecognized compensation costs for all share-based payment arrangements		$ 2,101,000
Number of shares, granted		2,025
Market Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 156,000	17,000
Maximum percentage of MPUs for senior executives		15.00%
Fair value period of MPUs		3 years
Term of MPUs		3 years
Accrued liabilities		$ 118,000			$ 352,000
Other non-current liabilities		$ 38,000			$ 72,000
Common stock, shares issued				47,404
2016 LTIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant		430,984
ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 59,000	$ 68,000
Number of shares authorized under the plan	5,000,000
Maximum percentage deductible from employees' gross pay	10.00%
Maximum amount deductible from employees gross pay	$ 25,000
ESPP [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum percentage of discount on common stock's fair market value	15.00%