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Discontinued Operations (Significant Operating and Investing Activities of Discontinued Operations) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Accounts payable and other accrued liabilities $ 9,308 $ (8,175)
Cash provided by (used in) operating activities, discontinued operations 0 (3,000)
Investing activities:    
Proceeds from sales of assets 228,555 130,011
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 100
Discontinued Operations    
Operating activities:    
Accounts payable and other accrued liabilities 0 (3,000)
Investing activities:    
Proceeds from sales of assets $ 0 $ 100