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Leases - Summary of Net Impact of Adoption Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Current assets              
Cash, cash equivalents, and restricted cash $ 52,143     $ 72,189 $ 45,686   $ 81,157
Accounts receivable, net 80,591     77,747      
Inventories 79,141     76,847      
Prepaid expenses and other current assets 20,954     17,856      
Total current assets 232,829     244,639      
Property, plant, and equipment, net 64,402     42,835      
Intangible assets, net and goodwill       124,298      
Deferred income taxes 37,566     33,228      
Other long-term assets 27,204     21,641      
Total assets 488,806     466,641      
Current liabilities              
Accounts payable 19,523     17,989      
Other current liabilities 48,161     67,919      
Total current liabilities 67,985     85,908      
Other long-term liabilities 52,180     45,336      
Total liabilities 141,012     131,244      
Shareholders’ equity              
Common shares $0.10 par value; 50,000,000 shares authorized; 18,831,581 and 18,579,688 issued and outstanding as of June 30, 2019 and December 31, 2018, respectively 1,883     1,858      
Additional paid-in capital 257,888     243,165      
Retained earnings 86,561     87,078      
Accumulated other comprehensive income 1,462     3,296      
Total shareholders’ equity 347,794 $ 343,682   335,397 $ 319,846 $ 313,174 $ 296,608
Total liabilities and shareholders’ equity $ 488,806     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 $0.10 par value; 50,000,000 shares authorized; 18,831,581 and 18,579,688 issued and outstanding as of June 30, 2019 and December 31, 2018, respectively     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