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Components of Income Before Provision for Income Taxes (Detail) (USD $)
In Thousands, 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
Schedule of Income Before Income Tax [Line Items]                      
Domestic                 $ 36,485us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 47,054us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 20,497us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign                 11,509us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 9,339us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 10,448us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) before provision (benefit) for income taxes $ 28,714us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 2,352us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 2,387us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 14,541us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 24,308us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments [1] $ 13,410us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 6,657us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 12,018us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 47,994us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 56,393us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 30,945us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
[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.