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Summary of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earning per share reconciliation                      
Net income $ 20,104us-gaap_NetIncomeLoss $ 1,882us-gaap_NetIncomeLoss $ 1,504us-gaap_NetIncomeLoss $ 9,765us-gaap_NetIncomeLoss $ 15,561us-gaap_NetIncomeLoss [1] $ 8,710us-gaap_NetIncomeLoss $ 4,703us-gaap_NetIncomeLoss $ 9,069us-gaap_NetIncomeLoss $ 33,255us-gaap_NetIncomeLoss $ 38,043us-gaap_NetIncomeLoss $ 21,868us-gaap_NetIncomeLoss
Weighted-average common shares outstanding                 76,327us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3] 75,946us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3] 75,706us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3]
Earnings per share, basic $ 0.27us-gaap_EarningsPerShareBasic [4] $ 0.02us-gaap_EarningsPerShareBasic [4] $ 0.02us-gaap_EarningsPerShareBasic [4] $ 0.13us-gaap_EarningsPerShareBasic [4] $ 0.21us-gaap_EarningsPerShareBasic [1],[4] $ 0.11us-gaap_EarningsPerShareBasic [4] $ 0.06us-gaap_EarningsPerShareBasic [4] $ 0.12us-gaap_EarningsPerShareBasic [4] $ 0.44us-gaap_EarningsPerShareBasic [2],[3] $ 0.50us-gaap_EarningsPerShareBasic [2],[3] $ 0.29us-gaap_EarningsPerShareBasic [2],[3]
Net income $ 20,104us-gaap_NetIncomeLoss $ 1,882us-gaap_NetIncomeLoss $ 1,504us-gaap_NetIncomeLoss $ 9,765us-gaap_NetIncomeLoss $ 15,561us-gaap_NetIncomeLoss [1] $ 8,710us-gaap_NetIncomeLoss $ 4,703us-gaap_NetIncomeLoss $ 9,069us-gaap_NetIncomeLoss $ 33,255us-gaap_NetIncomeLoss $ 38,043us-gaap_NetIncomeLoss $ 21,868us-gaap_NetIncomeLoss
Weighted-average common shares outstanding                 76,327us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3] 75,946us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3] 75,706us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2],[3]
Effect of assumed exercise of stock options, warrants and RSUs                 2,204us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [3] 2,028us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [3] 2,012us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [3]
Weighted-average common shares outstanding, assuming dilution                 78,531us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2],[3] 77,974us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2],[3] 77,718us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2],[3]
Earnings per share, diluted $ 0.26us-gaap_EarningsPerShareDiluted [4] $ 0.02us-gaap_EarningsPerShareDiluted [4] $ 0.02us-gaap_EarningsPerShareDiluted [4] $ 0.12us-gaap_EarningsPerShareDiluted [4] $ 0.20us-gaap_EarningsPerShareDiluted [1],[4] $ 0.11us-gaap_EarningsPerShareDiluted [4] $ 0.06us-gaap_EarningsPerShareDiluted [4] $ 0.12us-gaap_EarningsPerShareDiluted [4] $ 0.42us-gaap_EarningsPerShareDiluted [2],[3] $ 0.49us-gaap_EarningsPerShareDiluted [2],[3] $ 0.28us-gaap_EarningsPerShareDiluted [2],[3]
Outstanding options, warrants and RSUs excluded as impact would be antidilutive                 98us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 226us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 124us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock Options                      
Earning per share reconciliation                      
Weighted-average effect of dilutive securities                 1,698us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [3] 1,626us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [3] 1,554us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [3]
RSUs                      
Earning per share reconciliation                      
Weighted-average effect of dilutive securities                 506us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [3] 402us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [3] 458us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [3]
[1] Reflects the Company's acquisition of Antenna on October 9, 2013. See Note 8 "Acquisitions" for pro forma information for the year ended December 31, 2013.
[2] The number of common shares and per share amounts have been retroactively restated for all prior periods presented to reflect the Company's two-for-one common stock split effected in the form of a common stock dividend distributed on April 1, 2014.
[3] The number of common shares and per share amounts have been retroactively restated for all prior periods presented to reflect the Company's two-for-one common stock split effected in the form of a common stock dividend distributed on April 1, 2014. See Note 1 "Basis of Presentation" (d) for further discussion of the Stock Split.
[4] On March 6, 2014, the Company's Board of Directors approved a two-for-one stock split of the Company's common stock, effected in the form of a common stock dividend. See Note 1 "Basis of Presentation" (d) for further discussion of the Stock Split.