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The Company and Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share Basic And Diluted [Abstract]    
Net income (loss) $ 5,284us-gaap_NetIncomeLoss $ 4,388us-gaap_NetIncomeLoss
Denominator:    
Weighted average common shares outstanding, basic 87,531,375us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 88,683,948us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share:    
Net income (loss) per share, basic $ 0.06us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic
Net income (loss) $ 5,284us-gaap_NetIncomeLoss $ 4,388us-gaap_NetIncomeLoss
Denominator:    
Weighted average common shares outstanding, basic 87,531,375us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 88,683,948us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive securities:    
Stock options and restricted stock units 2,554,586us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2,259,918us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding, diluted 90,085,961us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 90,943,866us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share:    
Net income (loss) per share $ 0.06us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted