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Equity Method Investments - Summary of Abacus' Income Statement Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity Method Investment Summarized Financial Information Income Statement [Abstract]    
Revenue $ 79,814 $ 75,454
Operating income 11,419 9,993
Net income $ 13,458 $ 10,344