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
Beginning Balance at Dec. 31, 2018	5,238,765	2,315,988	(19,582)	2,942,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		45,329
Stock-based compensation expense		205,048
Other comprehensive income (loss)			(770)
Net income	614,702			614,702
Adoption of ASU 2016-02, Leases (Topic 842)	6,105,548	2,566,365	(20,352)	3,559,535
Ending Balance at Jun. 30, 2019	6,105,548	2,566,365	(20,352)	3,559,535
Beginning Balance at Dec. 31, 2018	5,238,765	2,315,988	(19,582)	2,942,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				1,429,263
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	2,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Adoption of ASU 2016-02, Leases (Topic 842)	$ 5,703,058	2,439,773	(25,600)	3,288,885
Beginning Balance at Mar. 31, 2019	5,703,058	2,439,773	(25,600)	3,288,885
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		22,744
Stock-based compensation expense		103,848
Other comprehensive income (loss)			5,248
Net income	270,650			270,650
Adoption of ASU 2016-02, Leases (Topic 842)	6,105,548	2,566,365	(20,352)	3,559,535
Ending Balance at Jun. 30, 2019	6,105,548	2,566,365	(20,352)	3,559,535
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
Adoption of ASU 2016-02, Leases (Topic 842)	7,582,157	2,793,929	(23,521)	4,811,749	2,474
Beginning Balance at Dec. 31, 2019	7,582,157	2,793,929	(23,521)	4,811,749	2,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		132,655
Stock-based compensation expense		201,229
Other comprehensive income (loss)			(10,551)
Net income	1,429,263
Adoption of ASU 2016-02, Leases (Topic 842)	7,582,157	3,127,813	(34,072)	6,241,012	$ 2,474
Ending Balance at Jun. 30, 2020	9,334,753	3,127,813	(34,072)	6,241,012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-02, Leases (Topic 842)	8,409,294	2,935,532	(47,054)	5,520,816
Beginning Balance at Mar. 31, 2020	8,409,294	2,935,532	(47,054)	5,520,816
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options		88,071
Stock-based compensation expense		104,210
Other comprehensive income (loss)			12,982
Net income	720,196			720,196
Adoption of ASU 2016-02, Leases (Topic 842)	8,409,294	3,127,813	(34,072)	6,241,012
Ending Balance at Jun. 30, 2020	9,334,753	3,127,813	(34,072)	6,241,012
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