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Comparative Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 30, 2016
Sep. 30, 2016
Jul. 01, 2016
Apr. 01, 2016
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Quarterly Financial Information [Line Items]                      
Revenues before reimbursements $ 82,718 $ 82,359 $ 84,120 $ 80,467 $ 72,753 $ 74,160 $ 73,334 $ 78,950 $ 329,664 $ 299,197 $ 295,705
Revenues 88,282 87,555 87,840 84,122 77,013 77,612 77,295 83,156 347,799 [1] 315,076 [1] 312,832 [1]
Operating income 17,795 19,305 20,317 14,634 14,949 15,595 14,931 16,436 72,051 61,911 68,933
Income before income taxes 20,721 22,030 22,348 17,410 16,791 17,920 16,677 17,734 82,509 69,122 71,133
Net income (loss) $ (3,705) [2] $ 14,643 $ 13,791 $ 16,576 $ 10,388 $ 11,289 $ 10,453 $ 15,350 $ 41,305 $ 47,480 $ 43,599
Net income per share                      
Basic $ (0.14) $ 0.56 $ 0.52 $ 0.63 $ 0.40 $ 0.43 $ 0.39 $ 0.58 $ 1.57 $ 1.79 $ 1.64
Diluted $ (0.14) $ 0.54 $ 0.51 $ 0.61 $ 0.39 $ 0.42 $ 0.38 $ 0.56 $ 1.53 $ 1.75 $ 1.6
Shares used in per share computations                      
Basic 26,363 26,370 26,415 26,302 26,262 26,545 26,631 26,513 26,362 26,488 26,606
Diluted 26,363 26,963 26,968 26,981 26,955 27,185 27,264 27,239 26,986 27,166 27,298
[1] Geographic revenues are allocated based on the location of the client.
[2] The decrease in net income and diluted earnings per share during the fourth quarter of 2017 was due to the impact of the new tax legislation. During the fourth quarter of 2017, the Company recorded a tax expense of $16,507,000 related to the new tax legislation signed into law during the fourth quarter of 2017. The Company has domestic deferred tax assets primarily associated with its deferred compensation plan and stock-based compensation program, which were previously valued at the federal corporate income tax rate of 35%. The Company’s deferred tax assets were re-measured at the lower enacted corporate tax rate of 21% which contributed $15,137,000 to the increase in income tax associated with the new tax legislation. The Company also has foreign earnings that were subject to the mandatory repatriation tax. The total mandatory repatriation tax, net of the benefit of its foreign tax credits, contributed $1,370,000 to the increase in income tax expense associated with the tax legislation.