Annual report pursuant to Section 13 and 15(d)

Change in Carrying Amount of Goodwill (Detail)

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Change in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Beginning balance $ 129,292 $ 73,885
Goodwill acquired 5,893 55,500
Other (1,160) (93)
Ending balance $ 134,025 $ 129,292