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Changes in Noncontrolling Interest (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Class of Stock [Line Items]        
Noncontrolling Interest, Beginning of Period     $ 45,919 $ 45,266
Net Loss 277 (547) (768) (1,490)
Other Comprehensive Income     233 194
Noncontrolling Interest, End of Period 44,597 46,377 44,597 46,377
Noncontrolling Interest [Member]
       
Class of Stock [Line Items]        
Conversion of Units to Common Stock     (2,710) (885)
Reallocation-Additional Paid in Capital     1,834 3,061
Reallocation-Other Comprehensive Income     $ 89 $ 231