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Schedule of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 441,920 $ 438,042 $ 460,147 $ 470,285 $ 442,204 $ 455,470 $ 449,137 $ 432,338 $ 1,810,394 $ 1,779,149 $ 1,756,212
Direct cost of revenues 308,239 293,702 303,194 305,636 299,336 301,609 291,469 279,030 1,210,771 1,171,444 1,144,757
Selling, general and administrative expenses 116,478 106,220 108,245 103,609 116,351 105,058 109,045 102,214 434,552 432,668 433,845
Special charges 3,634   1,750 5,061         10,445 0 16,339
Acquisition-related contingent consideration 623 201 206 1,134 (55) 159 (1,538) 234 2,164 (1,200) (1,676)
Amortization of other intangible assets 2,265 2,845 2,590 2,606 2,807 2,900 3,007 3,012 10,306 11,726 15,521
Costs and Expenses, Total 431,239 402,968 415,985 418,046 418,439 409,726 401,983 384,490 1,668,238 1,614,638 1,608,786
Operating income 10,681 35,074 44,162 52,239 23,765 45,744 47,154 47,848 142,156 164,511 147,426
Interest income and other 571 3,213 4,125 2,557 392 2,027 950 (137) 10,466 3,232 4,670
Interest expense (5,983) (6,304) (6,303) (6,229) (6,231) (11,696) (12,473) (12,368) (24,819) (42,768) (50,685)
Loss on early extinguishment of debt           (19,589)       (19,589)  
Income before income tax provision 5,269 31,983 41,984 48,567 17,926 16,486 35,631 35,343 127,803 105,386 101,411
Income tax provision (1,832) 10,292 15,437 18,386 7,577 6,177 13,922 11,657 42,283 39,333 42,604
Net income $ 7,101 $ 21,691 $ 26,547 $ 30,181 $ 10,349 $ 10,309 $ 21,709 $ 23,686 $ 85,520 $ 66,053 $ 58,807
Earnings per common share — basic $ 0.17 $ 0.53 $ 0.65 $ 0.75 $ 0.25 $ 0.25 $ 0.53 $ 0.59 $ 2.09 $ 1.62 $ 1.48
Earnings per common share — diluted $ 0.17 $ 0.52 $ 0.64 $ 0.73 $ 0.25 $ 0.25 $ 0.52 $ 0.57 $ 2.05 $ 1.58 $ 1.44
Weighted average number of common shares outstanding — basic 41,201 41,239 40,820 40,506 41,078 41,094 40,792 40,384 40,943 40,846 39,726
Diluted 42,018 42,065 41,599 41,148 41,879 41,982 41,696 41,324 41,709 41,729 40,729