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Other Investments - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Jun. 30, 2018
Schedule Of Equity Method Investments [Line Items]              
Equity interest, percentage 93.80% 93.80%   93.80%      
Aggregate cost of equity method investments $ 51,500,000            
Working capital adjustment relating to acquisition 200,000            
Pro-rata share of earnings from equity method investment       $ 2,767,000 $ 1,617,000    
Voting interest       25.00%      
Equity Investment   $ 76,441,000   $ 76,441,000     $ 69,215,000
Purchase price description of minority interest under equity method       The purchase price is equal to the greater of: (a) (i) the product of the aggregate trailing 12-month revenues of the equity investment preceding the date of purchase, multiplied by (ii) a factor of 2.9 multiplied by (iii) a factor of 0.723, multiplied by (iv) the percentage interest owned by each minority equity holder and (b) $966,666.      
Minimum purchase price consideration of remaining minority interest under equity method   966,666   $ 966,666      
Interest percentage in investment, accounted under cost method           10.00%  
Investment accounted under cost method           $ 4,500,000  
Other Long-term Liabilities | ASC 815-10, Derivatives and Hedging              
Schedule Of Equity Method Investments [Line Items]              
Equity method Investment, noncurrent liabilities $ 2,200,000            
Equity Investment              
Schedule Of Equity Method Investments [Line Items]              
Equity Investment   58,400,000   58,400,000     56,300,000
Privately-held Company              
Schedule Of Equity Method Investments [Line Items]              
Pro-rata share of earnings from equity method investment   $ 900,000 $ 1,100,000 $ 2,000,000 1,100,000    
Guangdong Fuxin Electronic Technology              
Schedule Of Equity Method Investments [Line Items]              
Equity interest, percentage   20.20%   20.20%      
Pro-rata share of earnings from equity method investment   $ 200,000 $ 200,000 $ 700,000 $ 500,000    
Total carrying value of equity method investment   $ 13,600,000   $ 13,600,000     $ 12,900,000