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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Assets or Investments (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]          
Land held for development     $ 0 $ 10,100,000 $ 54,200,000
Undeveloped land     3,000,000 20,100,000 9,000,000
Assets marketed for sale     42,000,000 28,600,000 0
Total continuing operations     44,989,000 58,783,000 63,161,000
Sold assets or assets held for sale - discontinued operations     27,608,000 67,688,000 62,683,000
Joint venture investments     980,000 26,671,000 2,921,000
Total impairment charges $ 6,800,000 $ 20,600,000 $ 73,577,000 $ 153,142,000 $ 128,765,000