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Schedule of Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Line Items]                      
Revenues $ 415,998 $ 414,643 $ 414,613 $ 407,178 $ 399,345 $ 386,055 $ 396,243 $ 395,228 $ 1,652,432 $ 1,576,871 $ 1,566,768
Direct cost of revenues 268,901 255,152 259,528 258,480 245,080 241,614 248,220 245,618 1,042,061 980,532 956,908
Selling, general and administrative expenses 107,196 94,513 96,325 96,647 94,058 88,909 92,460 102,589 394,681 378,016 373,295
Special charges 27,568 10,419   427   2,775 26,782   38,414 29,557 15,212
Acquisition-related contingent consideration (4,778) 630 (7,452) 731 (483) 403 (3,541) 557 (10,869) (3,064) (6,465)
Amortization of other intangible assets 5,661 5,776 5,953 5,564 5,634 5,766 5,490 5,517 22,954 22,407 22,371
Goodwill impairment charge   83,752     110,387       83,752 110,387  
Costs and Expenses 404,548 450,242 354,354 361,849 454,676 339,467 369,411 354,281 1,570,993 1,517,835 1,361,321
Operating income (loss) 11,450 (35,599) 60,259 45,329 (55,331) 46,588 26,832 40,947 81,439 59,036 205,447
Interest income and other 46 1,152 (387) 937 1,156 1,584 (363) 3,282 1,748 5,659 6,304
Interest expense (12,776) (12,814) (13,071) (12,715) (13,124) (13,208) (15,195) (15,204) (51,376) (56,731) (58,624)
Loss on early extinguishment of debt         (4,850)         (4,850)  
Income before income tax provision (1,280) (47,261) 46,801 33,551 (72,149) 34,964 11,274 29,025 31,811 3,114 153,127
Income tax provision 5,859 3,360 23,315 9,871 13,728 12,251 3,527 10,594 42,405 40,100 49,224
Net income (loss) $ (7,139) $ (50,621) $ 23,486 $ 23,680 $ (85,877) $ 22,713 $ 7,747 $ 18,431 $ (10,594) $ (36,986) $ 103,903
Earnings (loss) per common share - basic $ (0.18) $ (1.29) $ 0.60 $ 0.60 $ (2.15) $ 0.56 $ 0.19 $ 0.46 $ (0.27) $ (0.92) $ 2.53
Earnings (loss) per common share - diluted $ (0.18) $ (1.29) $ 0.58 $ 0.58 $ (2.15) $ 0.55 $ 0.18 $ 0.43 $ (0.27) $ (0.92) $ 2.39
Basic 39,115 39,094 39,143 39,403 39,913 40,387 40,592 40,358 39,188 40,316 41,131
Diluted 39,115 39,094 40,293 40,620 39,913 41,102 42,074 43,185 39,188 40,316 43,473