Business Segments (Narrative) (Detail)	Sep. 30, 2012 acre Well Hotel Rigs Country mi
Segment Reporting Information [Line Items]
Number of offshore drilling rigs	44
Number of countries where drilling rigs are located	14
Miles of natural gas pipeline	14,540
Acres of holding rights on minerals	700,000
Number of productive wells	6,000
Total number of parent hotels owned	18
Number of parent hotels in the United States	16
Number of parent hotels in Canada	2