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Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding shares, beginning balance 7,118
Granted, Shares 1,740
Exercised, Shares (2,445)
Forfeited or expired, Shares (275)
Outstanding shares, ending balance 6,138
Exercisable, Shares 1,678
Options vested or expected to vest, Shares 5,541
Outstanding, Weighted-Average Exercise Price, beginning balance $ 12.78
Granted, Weighted-Average Exercise Price $ 21.47
Exercised, Weighted-Average Exercise Price $ 11.37
Forfeited or expired, Weighted-Average Exercise Price $ 16.39
Outstanding, Weighted-Average Exercise Price, ending balance $ 15.65
Exercisable, Weighted-Average Exercise Price $ 11.72
Options vested or expected to vest, Weighted-Average Exercise Price $ 15.32
Outstanding, Weighted-Average Remaining Contractual Term (in years) 7 years 2 months 12 days
Exercisable, Weighted-Average Remaining Contractual Term (in years) 5 years 3 months 18 days
Options vested or expected to vest, Weighted-Average Remaining Contractual Term (in years) 7 years 1 month 6 days
Outstanding, Aggregate Intrinsic Value $ 138,302
Exercisable, Aggregate Intrinsic Value 44,386
Options vested or expected to vest, Aggregate Intrinsic Value $ 126,670