Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	$ 5,238,765	$ 2,315,988	$ (19,582)	$ 2,942,359	$ 2,474
Beginning Balance at Dec. 31, 2018	5,238,765	2,315,988	(19,582)	2,942,359	2,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		56,674
Stock-based compensation expense		305,310
Other comprehensive income (loss)			(21,664)
Net income	1,279,946			1,279,946
Adoption of ASU 2016-02, Leases (Topic 842)	6,861,505	2,677,972	(41,246)	4,224,779	2,474
Ending Balance at Sep. 30, 2019	$ 6,861,505	2,677,972	(41,246)	4,224,779
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning Balance at Dec. 31, 2018	$ 5,238,765	2,315,988	(19,582)	2,942,359	2,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				2,219,239
Adoption of ASU 2016-02, Leases (Topic 842)	5,238,765	2,315,988	(19,582)	2,942,359	$ 2,474
Ending Balance at Dec. 31, 2019	7,582,157	2,793,929	(23,521)	4,811,749
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	6,105,548	2,566,365	(20,352)	3,559,535
Beginning Balance at Jun. 30, 2019	6,105,548	2,566,365	(20,352)	3,559,535
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		11,345
Stock-based compensation expense		100,262
Other comprehensive income (loss)			(20,894)
Net income	665,244			665,244
Adoption of ASU 2016-02, Leases (Topic 842)	6,861,505	2,677,972	(41,246)	4,224,779
Ending Balance at Sep. 30, 2019	6,861,505	2,677,972	(41,246)	4,224,779
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	6,861,505	2,677,972	(41,246)	4,224,779
Adoption of ASU 2016-02, Leases (Topic 842)	7,582,157	2,793,929	(23,521)	4,811,749
Beginning Balance at Dec. 31, 2019	7,582,157	2,793,929	(23,521)	4,811,749
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		201,967
Stock-based compensation expense		307,586
Other comprehensive income (loss)			22,374
Net income	2,219,239
Adoption of ASU 2016-02, Leases (Topic 842)	10,333,323	3,303,482	(1,147)	7,030,988
Ending Balance at Sep. 30, 2020	10,333,323	3,303,482	(1,147)	7,030,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	9,334,753	3,127,813	(34,072)	6,241,012
Beginning Balance at Jun. 30, 2020	9,334,753	3,127,813	(34,072)	6,241,012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		69,312
Stock-based compensation expense		106,357
Other comprehensive income (loss)			32,925
Net income	789,976			789,976
Adoption of ASU 2016-02, Leases (Topic 842)	10,333,323	3,303,482	(1,147)	7,030,988
Ending Balance at Sep. 30, 2020	10,333,323	3,303,482	(1,147)	7,030,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	$ 10,333,323	$ 3,303,482	$ (1,147)	$ 7,030,988