Segment and Related Information - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenues From External Customers And Long Lived Assets [Line Items]
Number of reportable segments | segment									1
Total revenues	$ 454,088	$ 275,526	$ 292,936	$ 282,888	$ 309,892	$ 279,408	$ 258,369	$ 235,157	$ 1,305,438	$ 1,082,826	$ 1,236,915
Identifiable Assets	8,284,498				9,264,923				8,284,498	9,264,923
Australia
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									33,623	0	12,262
Identifiable Assets	244,244				243,388				244,244	243,388
Brazil
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	0
Identifiable Assets	8,910				13,299				8,910	13,299
Brunei
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	3,080	45,450
Identifiable Assets	0				0				0	0
Bulgaria
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									61,525	84,757	55,145
Identifiable Assets	0				645,689				0	645,689
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									46,147	47,085	1,639
Identifiable Assets	199,696				219,421				199,696	219,421
Curacao
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	0
Identifiable Assets	75,776				82,521				75,776	82,521
Denmark
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									31,076	35,855	44,671
Identifiable Assets	238,413				242,831				238,413	242,831
East Timor
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	33,733	0
Identifiable Assets	0				0				0	0
Egypt
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									49,209	112,473	0
Identifiable Assets	0				689,965				0	689,965
Gabon
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	0
Identifiable Assets	4,160				8,065				4,160	8,065
Guyana
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									132,414	50,839	0
Identifiable Assets	1,807,296				1,250,390				1,807,296	1,250,390
Malaysia
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									251,497	91,052	131,696
Identifiable Assets	30,012				665,822				30,012	665,822
Mexico
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	0
Identifiable Assets	28,032				27,542				28,032	27,542
Myanmar
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									56,207	16,572	0
Identifiable Assets	151,116				152,629				151,116	152,629
Qatar
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									36,948	35,180	16,488
Identifiable Assets	219,569				478,708				219,569	478,708
Saudi Arabia
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									154,807	156,989	140,453
Identifiable Assets	673,884				380,421				673,884	380,421
Singapore
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	1,769	0
Identifiable Assets	0				125,574				0	125,574
South Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	48,228
Identifiable Assets	0				0				0	0
Suriname
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									17,374	(3)	13,034
Identifiable Assets	599,659				0				599,659	0
Tanzania
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	381	1,526
Identifiable Assets	0				0				0	0
Turkey
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	0	(3)
Identifiable Assets	0				0				0	0
United Arab Emirates
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									0	(17)	99,825
Identifiable Assets	31,150				45,205				31,150	45,205
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									243,063	194,602	209,338
Identifiable Assets	1,373,524				1,152,596				1,373,524	1,152,596
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues									191,548	218,479	$ 417,163
Identifiable Assets	$ 2,599,057				$ 2,840,857				$ 2,599,057	$ 2,840,857