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Pro Forma Results of Combined Company Operations (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Business Acquisition Pro Forma Information [Abstract]        
Total Revenues $ 213,939 $ 201,238 $ 615,215 $ 612,784
Net income $ 9,603 $ 11,532 $ 12,252 $ 17,542
Income per share        
Basic $ 0.25 $ 0.29 $ 0.31 $ 0.46
Diluted $ 0.24 $ 0.28 $ 0.30 $ 0.44