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Insurance Activity - Summary of Losses and Loss Adjustment Reserve Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Statement Of Partners Capital [Abstract]    
Balance at beginning of period $ 82,524 $ 142,119
Incurred - prior periods 2,914 30,111
Paid - prior periods (7,039) (89,706)
Total $ 78,399 $ 82,524