Segment and Related Information - Revenues and Identifiable Assets by Country Based on the Location of the Service Provided (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 857,684	$ 896,671	$ 793,555	$ 804,342	$ 804,740	$ 828,796	$ 803,781	$ 795,187	$ 3,352,252	$ 3,232,504	$ 2,538,143
Identifiable Assets	12,891,984				13,286,822				12,891,984	13,286,822
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									1,941,485	1,639,509	1,338,634
Identifiable Assets	6,668,879				6,739,636				6,668,879	6,739,636
Argentina [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									111,589	97,743
Identifiable Assets	273,397				304,131				273,397	304,131
Australia [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									204,822	146,474	133,214
Identifiable Assets	944,277				541,655				944,277	541,655
Benin [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues										66,077	41,251
Brazil [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									78,683	447,266	527,706
Identifiable Assets	697,638				799,599				697,638	799,599
Denmark [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									77,934	28,980
Identifiable Assets	501,747				272,788				501,747	272,788
Gabon [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									90,082	72,562	6,314
Identifiable Assets	684,243								684,243
Libya [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									136,406
Malaysia [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									149,597	11,126
Identifiable Assets	890,991				1,144,498				890,991	1,144,498
New Zealand [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues										56,911	11,995
Saudi Arabia [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									226,251	260,544	246,083
Identifiable Assets	495,501				479,525				495,501	479,525
Singapore [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Identifiable Assets	775,962				982,731				775,962	982,731
The Netherlands [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									67,765	82,026
Identifiable Assets					249,074					249,074
Turkey [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									97,065	13,960
Identifiable Assets					740,362					740,362
United Arab Emirates [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									67,117	108,044	71,896
Identifiable Assets	352,546				331,812				352,546	331,812
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									87,896	84,078	87,908
Identifiable Assets	430,058				248,835				430,058	248,835
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									15,560	117,204	$ 73,142
Identifiable Assets	$ 176,745				$ 452,176				$ 176,745	$ 452,176