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Schedule of Weighted Average Stock Options Exercise Price (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award      
Outstanding at January 1 $ 4.64 $ 4.12 $ 16.32
Options granted $ 16.56 $ 16.95 $ 16.23
Assumed from acquisition     $ 2.69
Options exercised $ 3.28 $ 3.87 $ 4.38
Options forfeited $ 2.57 $ 3.11  
Options cancelled $ 8.05 $ 16.21 $ 26.38
Outstanding at December 31 $ 6.29 $ 4.64 $ 4.12
Exercisable at December 31 $ 4.55 $ 3.70 $ 4.10