Activity in Real Estate Assets Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Property
Number of Properties  
Balance, December 31, 2013 11
Transfers from real estate investments 6
Sales (Note 11) (5)
Balance, June 30, 2014 12 [1]
Carrying Value  
Balance, December 31, 2013 $ 19,611
Transfers from real estate investments 29,290
Sales (Note 11) (7,946)
Balance, June 30, 2014 $ 40,955 [1]
[1] Includes six properties with a net carrying amount of $29.1 million in which its operating results are reported in continuing operations.