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Employee Benefits (Detail) - Information Related to Changes in Projected Benefit Obligation (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 34,585us-gaap_DefinedBenefitPlanBenefitObligation $ 31,605us-gaap_DefinedBenefitPlanBenefitObligation $ 21,160us-gaap_DefinedBenefitPlanBenefitObligation
Service cost 2,630us-gaap_DefinedBenefitPlanServiceCost [1] 2,545us-gaap_DefinedBenefitPlanServiceCost [1] 1,775us-gaap_DefinedBenefitPlanServiceCost [1]
Interest cost 1,190us-gaap_DefinedBenefitPlanInterestCost 1,075us-gaap_DefinedBenefitPlanInterestCost 980us-gaap_DefinedBenefitPlanInterestCost
Actuarial loss (gain) due to assumption changes and plan experience 6,300it_DefinedBenefitPlanActuarialGainsLosses [2] 625it_DefinedBenefitPlanActuarialGainsLosses [2] 6,265it_DefinedBenefitPlanActuarialGainsLosses [2]
Additions and contractual termination benefits 30us-gaap_DefinedBenefitPlanPlanAmendments 460us-gaap_DefinedBenefitPlanPlanAmendments 1,925us-gaap_DefinedBenefitPlanPlanAmendments
Benefits paid (1,350)us-gaap_DefinedBenefitPlanBenefitsPaid [3] (1,255)us-gaap_DefinedBenefitPlanBenefitsPaid [3] (680)us-gaap_DefinedBenefitPlanBenefitsPaid [3]
Foreign currency impact (5,270)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation (470)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation 180us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation
Projected benefit obligation at end of year $ 38,115us-gaap_DefinedBenefitPlanBenefitObligation $ 34,585us-gaap_DefinedBenefitPlanBenefitObligation $ 31,605us-gaap_DefinedBenefitPlanBenefitObligation
[1] The higher service cost beginning in 2013 was primarily due to additional employees covered under the plans.
[2] The 2014 and 2012 actuarial losses were primarily due to significant declines in the weighted-average discount rate.
[3] The Company projects the following approximate amounts will be paid in future years to plan participants: $1.0 million in 2015; $1.9 million in 2016; $1.4 million in each of the years 2017, 2018, and 2019; and $9.6 million in total in the five years thereafter.