Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Organization And Summary Of Significant Accounting Policies [Line Items]
Length of time financial statements and notes presented					365 days	365 days	365 days
Proceeds from Sale of Finance Receivables					$ 16,900	$ 7,600	$ 34,000
Minimum percentage chance of tax benefit realization in final settlement	50.00%				50.00%
TCJA, income tax expense (benefit)				$ 139,200
TCJA, remeasurement, income tax expense (benefit)		$ 200
Repatriation amount	$ 32,800		$ 600
TCJA, provisional income tax expense (benefit), toll charge		$ 8,000				$ 2,000,000
Concentration risk threshold					10.00%
Tax reform, toll charge				100,600
Prior service costs from plan improvements amortization period, minimum, years					10 years
Prior service costs from plan improvements amortization period, maximum, years					20 years
Amortization period of internal and external development costs, years					7 years
Stock options and stock settled appreciation rights (SSARs) excluded from calculation of diluted shares					0	0	0
Difference amount between basic and diluted net income per share (in dollars per share)					$ 0.02	$ 0.01	$ 0.01
Net income					$ 339,781	$ 295,665	$ 405,031
Increase (decrease) in accrued liabilities and other operating liabilities						(28,800)	(14,400)
Net cash provided by operating activities					437,575	390,756	550,139
Net cash used in financing activities					$ 4,870,703	(42,558)	(34,427)
Percentage Of Products Customized To Customer Specifications Which Have No Alternative Use					90.00%
Inventories	$ 1,078,537			649,448	$ 1,078,537	649,448
Gross Profit					1,682,707	1,472,463	1,395,563
Restricted Stock [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Net income					$ 1,000	1,000	$ 1,000
Machinery and equipment [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					20 years
Minimum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Length of time Company historically operated					365 days
Minimum [Member] | Customer Relationships [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					11 years
Minimum [Member] | Trade Names [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					14 years
Minimum [Member] | Technological Know-how [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					5 years
Minimum [Member] | Buildings And Improvements [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					10 years
Minimum [Member] | Machinery and equipment [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					3 years
Minimum [Member] | Information Technology Hardware And Software [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					3 years
Maximum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Length of time Company historically operated					372 days
Maximum [Member] | Customer Relationships [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					23 years
Maximum [Member] | Patents [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					11 years
Maximum [Member] | Trade Names [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					28 years
Maximum [Member] | Technological Know-how [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Other intangible assets amortized period, years					28 years
Maximum [Member] | Buildings And Improvements [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					40 years
Maximum [Member] | Information Technology Hardware And Software [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment, years					7 years
Accounting Standards Update 2014-09 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment relating to the adoption of ASC 2016-16				2,068		2,068
Prepaid Expense and Other Assets								$ 4,400
Inventories								(1,700)
Taxes Payable								600
Sales Revenue, Net | Geographic Concentration Risk
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration risk threshold					3.3685%
Assets, Total | Geographic Concentration Risk
Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration risk threshold					1.46803%
Retained earnings [Member] | Accounting Standards Update 2014-09 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Cumulative adjustment relating to the adoption of ASC 2016-16				$ 2,068		$ 2,068		$ 2,100
Difference between Revenue Guidance in Effect before and after Topic 606
Organization And Summary Of Significant Accounting Policies [Line Items]
Net income					$ 1,900
Revenues					4,000
Gross Profit					$ 2,600