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Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2015 | Oct. 03, 2014 | Jul. 04, 2014 | Apr. 04, 2014 | Jan. 03, 2014 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues before reimbursements | $ 69,647 us-gaap_SalesRevenueServicesNet | $ 74,264 us-gaap_SalesRevenueServicesNet | $ 72,331 us-gaap_SalesRevenueServicesNet | $ 72,967 us-gaap_SalesRevenueServicesNet | $ 69,036 us-gaap_SalesRevenueServicesNet | $ 70,096 us-gaap_SalesRevenueServicesNet | $ 71,919 us-gaap_SalesRevenueServicesNet | $ 68,992 us-gaap_SalesRevenueServicesNet | $ 289,209 us-gaap_SalesRevenueServicesNet |  | $ 280,043 us-gaap_SalesRevenueServicesNet |  | $ 266,562 us-gaap_SalesRevenueServicesNet |
Revenues | 73,611 us-gaap_Revenues | 78,557 us-gaap_Revenues | 76,574 us-gaap_Revenues | 75,962 us-gaap_Revenues | 72,772 us-gaap_Revenues | 75,231 us-gaap_Revenues | 75,505 us-gaap_Revenues | 72,660 us-gaap_Revenues | 304,704 us-gaap_Revenues | [1] | 296,168 us-gaap_Revenues | [1] | 292,653 us-gaap_Revenues | [1]
Operating income | 14,133 us-gaap_OperatingIncomeLoss | 19,238 us-gaap_OperatingIncomeLoss | 16,084 us-gaap_OperatingIncomeLoss | 14,094 us-gaap_OperatingIncomeLoss | 12,342 us-gaap_OperatingIncomeLoss | 15,160 us-gaap_OperatingIncomeLoss | 17,593 us-gaap_OperatingIncomeLoss | 10,851 us-gaap_OperatingIncomeLoss | 63,549 us-gaap_OperatingIncomeLoss |  | 55,946 us-gaap_OperatingIncomeLoss |  | 57,620 us-gaap_OperatingIncomeLoss |
Income before income taxes | 15,827 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 18,375 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 18,398 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 15,365 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 14,654 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,515 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 18,271 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,505 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 67,965 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 63,945 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 61,749 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Net income | $ 9,243 us-gaap_NetIncomeLoss | $ 11,040 us-gaap_NetIncomeLoss | $ 11,264 us-gaap_NetIncomeLoss | $ 9,154 us-gaap_NetIncomeLoss | $ 8,722 us-gaap_NetIncomeLoss | $ 11,094 us-gaap_NetIncomeLoss | $ 10,848 us-gaap_NetIncomeLoss | $ 7,976 us-gaap_NetIncomeLoss | $ 40,701 us-gaap_NetIncomeLoss |  | $ 38,640 us-gaap_NetIncomeLoss |  | $ 37,225 us-gaap_NetIncomeLoss |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.70 us-gaap_EarningsPerShareBasic | $ 0.82 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.64 us-gaap_EarningsPerShareBasic | $ 0.82 us-gaap_EarningsPerShareBasic | $ 0.80 us-gaap_EarningsPerShareBasic | $ 0.58 us-gaap_EarningsPerShareBasic | $ 3.02 us-gaap_EarningsPerShareBasic |  | $ 2.84 us-gaap_EarningsPerShareBasic |  | $ 2.70 us-gaap_EarningsPerShareBasic |
Diluted (in dollars per share) | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.80 us-gaap_EarningsPerShareDiluted | $ 0.81 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 0.56 us-gaap_EarningsPerShareDiluted | $ 2.94 us-gaap_EarningsPerShareDiluted |  | $ 2.76 us-gaap_EarningsPerShareDiluted |  | $ 2.60 us-gaap_EarningsPerShareDiluted |
Shares used in per share computations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 13,293 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,469 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,520 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,537 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,556 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,598 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,637 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,667 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,455 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 13,616 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 13,780 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Diluted | 13,659 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,824 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,873 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,949 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,993 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,007 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,125 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,833 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 14,025 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 14,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
[1] | Geographic revenues are allocated based on the location of the client.

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