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Stock Option Activity (Detail) (USD $)
 9 Months Ended
Sep. 30, 2012
Weighted Average Exercise Price  
Outstanding, Weighted Average Exercise Price, Beginning Balance $ 10.97
Granted, Weighted Average Exercise Price $ 17.50
Cancelled, Weighted Average Exercise Price $ 14.33
Exercised, Weighted Average Exercise Price $ 9.40
Outstanding, Weighted Average Exercise Price, Ending Balance $ 12.43
Number of Shares  
Outstanding, Number of Shares, Beginning Balance 2,912,000
Granted, Number of Shares 601,000
Cancelled, Number of Shares (73,000)
Exercised, Number of Shares (443,000)
Outstanding, Number of Shares, Ending Balance 2,997,000
Options exercisable, Number of Shares 1,359,000
Weighted Average Remaining Contractual Life  
Outstanding, Weighted Average Remaining Contractual Life (In Years) 6 years 1 month 24 days
Options exercisable, Weighted Average Remaining Contractual Life (In Years) 3 years 11 months 12 days
Aggregate Intrinsic Value  
Outstanding, Aggregate Intrinsic Value $ 31,265,000
Options exercisable, Aggregate Intrinsic Value $ 18,961,000