Revenue Recognition and Accounts Receivable - Schedule of Net Impact of Adoption to Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash, cash equivalents, and restricted cash					$ 70,403
Accounts receivable, net	$ 73,053				86,805
Inventories	82,859				82,397
Prepaid expenses and other current assets	18,457				20,948
Total current assets	254,669				260,553
Deferred income taxes	38,047				35,117
Other long-term assets					199,950
Total assets	517,132				495,620
Liabilities and shareholders’ equity
Total liabilities	162,236				167,989
Shareholders’ equity
Common shares	1,927				1,902
Additional paid-in capital	285,203				271,019
Retained earnings	68,757				57,749
Accumulated other comprehensive loss	(991)				(3,039)
Total shareholders’ equity	354,896	$ 345,045	$ 355,369		327,631	$ 306,434	$ 347,794	$ 343,682	$ 335,397
Total liabilities and shareholders’ equity	$ 517,132				495,620
ASU 2016-13 [Member]
Current assets
Cash, cash equivalents, and restricted cash				$ 70,403
Accounts receivable, net				85,685
Inventories				82,397
Prepaid expenses and other current assets				20,948
Total current assets				259,433
Deferred income taxes				35,350
Other long-term assets				199,950
Total assets				494,733
Liabilities and shareholders’ equity
Total liabilities				167,989
Shareholders’ equity
Common shares				1,902
Additional paid-in capital				271,019
Retained earnings				56,862
Accumulated other comprehensive loss				(3,039)
Total shareholders’ equity				326,744
Total liabilities and shareholders’ equity				$ 494,733
ASU 2016-13 [Member] | Impact of Adoption of ASC 326 [Member]
Current assets
Accounts receivable, net					(1,120)
Total current assets					(1,120)
Deferred income taxes					233
Total assets					(887)
Shareholders’ equity
Retained earnings					(887)
Total shareholders’ equity					(887)
Total liabilities and shareholders’ equity					$ (887)