Geographic and Other Information - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member] | Standard Products Group [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	87.00%	90.00%	88.00%	90.00%
Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer One [Member] | Standard Products Group [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	52.90%	56.10%	54.00%	52.60%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			39.40%		43.10%
Geographic Concentration Risk [Member] | Net Sales [Member] | Asia Pacific Other Than Korea [Member] | Standard Products Group [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	87.70%		88.40%
Geographic Concentration Risk [Member] | Net Sales [Member] | CHINA | Standard Products Group [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		95.80%		95.80%