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Progression of Company's Goodwill and Intangible Assets for Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill      
Beginning Balance $ 83,056 $ 84,914 $ 84,648
Acquisitions and dispositions, net 21,810 (619) 1,305
Impairment   (1,239) (1,039)
Ending Balance 104,866 83,056 84,914
Other Intangible Assets      
Beginning Balance 4,326 5,725 6,413
Acquisitions and dispositions, net   (379) 344
Amortization (804) (1,020) (1,032)
Ending Balance $ 3,522 $ 4,326 $ 5,725