Equity Compensation Plans - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 27, 2012	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 1,000,000	$ 1,000,000	$ 3,200,000	$ 3,100,000
Equity compensation costs capitalized as part of inventory				$ 0
Stock options granted (shares)		0	0	0	18,300
Stock options exercised (shares)		6,170	18,863	34,634	46,502
Cash received from exercise of stock option		$ 100,000	$ 200,000	$ 400,000	$ 600,000
Number of options exercised, intrinsic value		200,000	700,000	1,400,000	1,300,000
Intrinsic value of stock options exercised, tax benefit		100,000	$ 200,000	$ 400,000	$ 300,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, term				10 years
Total unrecognized compensation cost		1,800,000		$ 1,800,000
Weighted average expected amortization period				2 years 7 months 10 days
Employee Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period				3 years
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period				4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost		$ 3,700,000		$ 3,700,000
Weighted average expected amortization period				1 year 9 months 18 days
Unvested restricted stock awards (shares)		187,620		187,620
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		0	8,570	0	16,500
Restricted shares vested (shares)		6,000	6,000	15,288	14,129
Time Based Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period				2 years
Time Based Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period				4 years
Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)		0	0		7,380
Restricted shares vested (shares)		0	0	108,600	65,087
Performance Based Restricted Stock Awards | Earnings Target in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (shares)				18,100
Stock Option Plan 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share options and restricted shares authorized (shares)	1,750,000
Additional shares authorized under the plan (shares)	1,200,000