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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2012 1,936
Number of Shares, Granted 430
Number of Shares, Exercised (408)
Number of Shares, Forfeited (52)
Number of Shares, Outstanding at June 30, 2013 1,906
Number of Shares, Exercisable at June 30, 2013 967
Weighted Average Exercise Price Per Share, Outstanding, Beginning balance $ 29.03
Weighted Average Exercise Price Per Share, Granted $ 34.91
Weighted Average Exercise Price Per Share, Exercised $ 24.70
Weighted Average Exercise Price Per Share, Forfeited $ 31.49
Weighted Average Exercise Price Per Share, Outstanding, Ending balance $ 31.21
Weighted Average Exercise Price Per Share, Exercisable at June 30, 2013 $ 28.61
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2013 7 years 1 month 24 days
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2013 5 years 3 months 29 days
Aggregate Intrinsic Value, Outstanding at June 30, 2013 $ 10,553
Aggregate Intrinsic Value, Exercisable at June 30, 2013 $ 7,870