Leases - Summary of Net Impact of Adoption Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash, cash equivalents, and restricted cash	$ 57,503				$ 72,189	$ 56,242			$ 81,157
Accounts receivable, net	79,690				77,747
Inventories	80,993				76,847
Prepaid expenses and other current assets	19,617				17,856
Total current assets	237,803				244,639
Property, plant, and equipment, net	62,964				42,835
Intangible assets, net and goodwill					124,298
Deferred income taxes	39,626				33,228
Other long-term assets	10,420				21,641
Total assets	475,603				466,641
Current liabilities
Accounts payable	17,892				17,989
Other current liabilities	70,323				67,919
Total current liabilities	88,508				85,908
Other long-term liabilities	59,894				45,336
Total liabilities	169,169				131,244
Shareholders’ equity
Common shares	1,888				1,858
Additional paid-in capital	263,064				243,165
Retained earnings	46,063				87,078
Accumulated other comprehensive income	(4,581)				3,296
Total shareholders’ equity	306,434	$ 347,794	$ 343,682		335,397	$ 323,350	$ 319,846	$ 313,174	$ 296,608
Total liabilities and shareholders’ equity	$ 475,603				466,641
ASU 2016-02 [Member]
Current assets
Cash, cash equivalents, and restricted cash				$ 72,189
Accounts receivable, net				77,747
Inventories				76,847
Prepaid expenses and other current assets				17,841
Total current assets				244,624
Property, plant, and equipment, net				42,835
Intangible assets, net and goodwill				124,298
Deferred income taxes				33,299
Other long-term assets				41,850
Total assets				486,906
Current liabilities
Accounts payable				17,989
Other current liabilities				70,085
Total current liabilities				88,074
Other long-term liabilities				63,364
Total liabilities				151,438
Shareholders’ equity
Common shares				1,858
Additional paid-in capital				243,165
Retained earnings				87,149
Accumulated other comprehensive income				3,296
Total shareholders’ equity				335,468
Total liabilities and shareholders’ equity				$ 486,906
ASU 2016-02 [Member] | Impact of Adoption of ASC 842 [Member]
Current assets
Prepaid expenses and other current assets					(15)
Total current assets					(15)
Deferred income taxes					71
Other long-term assets					20,209
Total assets					20,265
Current liabilities
Other current liabilities					2,166
Total current liabilities					2,166
Other long-term liabilities					18,028
Total liabilities					20,194
Shareholders’ equity
Retained earnings					71
Total shareholders’ equity					71
Total liabilities and shareholders’ equity					$ 20,265