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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net income $ 33,786us-gaap_NetIncomeLoss $ 31,245us-gaap_NetIncomeLoss
Denominator:    
Shares used in net income per common share - basic 53,214,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 53,411,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:    
Stock options, restricted stock and employee stock purchase plan 315,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 365,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares used in net income per common share - diluted 53,529,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 53,776,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share:    
Basic $ 0.63us-gaap_EarningsPerShareBasic $ 0.58us-gaap_EarningsPerShareBasic
Diluted $ 0.63us-gaap_EarningsPerShareDiluted $ 0.58us-gaap_EarningsPerShareDiluted