Summary of Property Plant Equipment by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 2,115,176		$ 1,958,877
Accumulated Depreciation	(833,385)		(857,012)
Net Book Value	1,281,791	[1]	1,101,865	[1]
Marine Vessels
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	882,921		812,322
Construction Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	546,305		545,765
Contracts in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	395,949		343,555
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	165,853		136,587
All other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 124,148		$ 120,648

[1] Our marine vessels are included in the country in which they were located as of year-end.