Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Accounting Policies [Line Items]
Cash collected on behalf of factor	$ 36,248
Allowance for doubtful accounts	4,199	$ 7,124
Advertising expense	3,769	3,553	$ 3,418
Amounts capitalized for long-term supply arrangements	2,091	2,874
Tooling receivable	112,561	90,974
Reimbursable tooling costs	21,506	16,393
Research and Development Expense	$ 127,974	$ 117,791	$ 108,764
Property, Plant and Equipment, Other Types [Member]
Schedule Of Accounting Policies [Line Items]
Amortization period for molds, dies and other tools	3 years