Inventories, Net - Allowance for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory Valuation And Obsolescence [Roll Forward]
Balance at beginning of year	$ 46,505	$ 34,402
Provision	28,593	27,341	$ 21,400
Charges processed	(26,509)	(15,238)
Balance at end of year	$ 48,589	$ 46,505	$ 34,402