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Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal                      
Current                 $ 1,236 $ 4,150 $ 1,812
Deferred                 56 6,456 12,352
Total                 1,292 10,606 14,164
State                      
Current                 1,150 1,649 1,685
Deferred                 (142) 621 (725)
Total                 1,008 2,270 960
Foreign                      
Current                 9,258 5,149 6,366
Deferred                 4,864 436 17
Total                 14,122 5,585 6,383
Income tax provision $ 24,347 $ (1,175) $ (6,195) $ (555) $ 12,106 $ 482 $ 704 $ 5,169 $ 16,422 $ 18,461 $ 21,507