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Earnings per Common Share - Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Detail) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic	16,685	16,594	16,678	16,575
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	92
Weighted Average Number of Shares Outstanding, Diluted	16,685	16,686	16,678	16,644
Basic net earnings per common share (in dollars per share)	$ (3.10)	$ 1.37	$ (2.37)	$ 2.00
Diluted net earnings per common share (in dollars per share)	$ (3.10)	$ 1.36	$ (2.37)	$ 1.99
Anti-dilutive shares excluded from calculation	700	700	600	800
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	92

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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