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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, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2013 1,734
Number of Shares, Granted 111
Number of Shares, Exercised (110)
Number of Shares, Forfeited (57)
Number of Shares, Outstanding at June 30, 2014 1,678
Number of Shares, Exercisable at June 30, 2014 943
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance $ 31.85
Weighted - Average Exercise Price Per Share, Granted $ 36.80
Weighted - Average Exercise Price Per Share, Exercised $ 31.37
Weighted - Average Exercise Price Per Share, Forfeited $ 34.57
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance $ 32.11
Weighted - Average Exercise Price Per Share, Exercisable at June 30, 2014 $ 29.96
Weighted - Average Remaining Contractual Term, Outstanding at June 30, 2014 6 years 8 months 9 days
Weighted - Average Remaining Contractual Term, Exercisable at June 30, 2014 5 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding at June 30, 2014 $ 9,710
Aggregate Intrinsic Value, Exercisable at June 30, 2014 $ 7,493