Correction of Error in Previously Reported 2020 Interim Financial Statements (Unaudited) - Schedule of Effect of Error on Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total current assets	$ 289,840	$ 209,147	$ 331,839	$ 467,117	$ 427,802
Total non-current assets		5,803,751	6,120,372	6,122,521
Total current liabilities	706,841	630,120	530,253	490,125	566,544
Total non-current liabilities		3,788,810	3,585,936	3,603,705
Deferred tax liabilities	135,267	130,855	167,342	189,583	160,196
Total liabilities	4,499,401	4,418,930	4,116,189	4,093,830	4,264,915
Retained deficit	(4,018,685)	(4,057,086)	(3,308,296)	(3,140,639)	(3,306,834)
Total stockholders’ equity	1,637,535	1,593,968	2,336,022	2,495,808	2,347,488	$ 4,059,431	$ 5,774,272
Total liabilities and stockholders’ equity	$ 6,136,936	6,012,898	6,452,211	6,589,638	$ 6,612,403
Originally Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total current assets		209,147	331,839	467,117
Total non-current assets		5,803,751	6,120,372	6,122,521
Total current liabilities		630,120	530,253	490,125
Total non-current liabilities		3,720,274	3,586,142	3,624,925
Deferred tax liabilities		62,319	167,548	210,803
Total liabilities		4,350,394	4,116,395	4,115,050
Retained deficit		(3,988,550)	(3,308,502)	(3,161,859)
Total stockholders’ equity		1,662,504	2,335,816	2,474,588
Total liabilities and stockholders’ equity		6,012,898	6,452,211	6,589,638
Adjustments
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total non-current liabilities		68,536	(206)	(21,220)
Deferred tax liabilities		68,536	(206)	(21,220)
Total liabilities		68,536	(206)	(21,220)
Retained deficit		(68,536)	206	21,220
Total stockholders’ equity		$ (68,536)	$ 206	$ 21,220