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Restricted Stock Units Award Activity (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Activity Related To Restricted Shares And Restricted Share [Line Items]      
Outstanding at beginning of year 1,111 1,254 1,612
Granted 395 389 371
Vested (415) (425) (530)
Forfeited (111) (107) (199)
Outstanding as of December 31, 980 1,111 1,254