Stockholders' Equity - Stock Option Activities of Long-Term Incentive and Option Plans (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders Equity [Line Items]
Shares outstanding at beginning of year	124,000
Shares outstanding at end of year	124,000	124,000
Shares exercisable at end of year	111,750
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 33.86
Outstanding at end of year, Weighted-Average Exercise Price	33.86	$ 33.86
Exercisable at end of year, Weighted-Average Exercise Price	$ 33.91
Stock-based compensation expense - Cost of sales	$ 122,000	$ 141,000	$ 317,000
Stock-based compensation expense - SG&A	50,000	71,000	108,000
Income tax benefit	(42,000)	(54,000)	(164,000)
Total fair value of options vested during the year	$ 169,000	$ 169,000	451,000
Total intrinsic value of options outstanding at end of year			16,000
Total intrinsic value of options exercisable at end of year			$ 16,000
Total weighted-average remaining vesting period in years	5 months 26 days	1 year 18 days	1 year 6 months 10 days
Total weighted-average remaining contractual life period in years (options outstanding)	3 years 7 months 9 days	4 years 7 months 9 days	5 years 1 month 6 days
Total weighted-average remaining contractual life period in years (options exercisable)	3 years 5 months 19 days	4 years 3 months 21 days	4 years 5 months 8 days
2016 Plan [Member]
Stockholders Equity [Line Items]
Granted, Shares	0	0	0
Maximum number of securities for issuance	2,750,000
Number of awards available to be granted	1,285,922			2,750,000
2016 Plan [Member] | Restricted Stock/Performance-Based Restricted Stock/Restricted Stock Units [Member]
Stockholders Equity [Line Items]
Number of unvested restricted stock/performance-based restricted stock/restricted stock units outstanding	925,851
2008 Plan [Member]
Stockholders Equity [Line Items]
Shares outstanding at end of year	124,000
Shares exercisable at end of year	111,750