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Summary of Restricted Stock Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Restricted Shares    
Restricted stock, Shares, Beginning Balance 1,817,745 1,478,000
Restricted stock, Shares, Granted 394,928 575,694
Restricted stock, Shares, Vested (405,309) (219,469)
Restricted stock, Shares, Cancellations (8,945) (4,340)
Restricted stock, Shares, Ending Balance 1,798,419 1,829,885
Fair Market Value at Date of Grant    
Restricted stock, Fair Market Value at Date of Grant, Beginning Balance $ 40,655 $ 30,600
Restricted stock, Granted, Fair Market Value at Date of Grant 10,846 16,005
Restricted stock, Vested, Fair Market Value at Date of Grant (9,185) (5,608)
Restricted stock, Shares, Cancellations (188) (96)
Restricted stock, Fair Market Value at Date of Grant, Ending Balance $ 42,128 $ 40,901