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Interim Consolidated Financial Statements - Revised Consolidated Statements of Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
As Previously Reported [Member]
Mar. 31, 2013
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Sep. 30, 2012
As Previously Reported [Member]
Jun. 30, 2012
As Previously Reported [Member]
Mar. 31, 2012
As Previously Reported [Member]
Jun. 30, 2013
As Previously Reported [Member]
Jun. 30, 2012
As Previously Reported [Member]
Sep. 30, 2012
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Dec. 31, 2011
As Previously Reported [Member]
Jun. 30, 2013
Adjustments [Member]
Mar. 31, 2013
Adjustments [Member]
Dec. 31, 2012
Adjustments [Member]
Sep. 30, 2012
Adjustments [Member]
Jun. 30, 2012
Adjustments [Member]
Mar. 31, 2012
Adjustments [Member]
Jun. 30, 2013
Adjustments [Member]
Jun. 30, 2012
Adjustments [Member]
Sep. 30, 2012
Adjustments [Member]
Dec. 31, 2012
Adjustments [Member]
Dec. 31, 2011
Adjustments [Member]
Jun. 30, 2013
As Revised [Member]
Mar. 31, 2013
As Revised [Member]
Dec. 31, 2012
As Revised [Member]
Sep. 30, 2012
As Revised [Member]
Jun. 30, 2012
As Revised [Member]
Mar. 31, 2012
As Revised [Member]
Jun. 30, 2013
As Revised [Member]
Jun. 30, 2012
As Revised [Member]
Sep. 30, 2012
As Revised [Member]
Dec. 31, 2012
As Revised [Member]
Dec. 31, 2011
As Revised [Member]
Revenues:                                                                          
Research services $ 49,855 $ 50,509 $ 151,445 $ 151,145 $ 50,512 $ 50,378 $ 51,866 $ 50,300 $ 51,072 $ 49,760 $ 100,890 $ 100,832 $ 151,132 $ 202,998 $ 191,648 $ 800 $ (100) $ 80 $ 209 $ (100) $ (96) $ 700 $ (196) $ 13 $ 93 $ (153) $ 51,312 $ 50,278 $ 51,946 $ 50,509 $ 50,972 $ 49,664 $ 101,590 $ 100,636 $ 151,145 $ 203,091 $ 191,495
Advisory services and other 19,960 18,264 68,684 66,725 27,652 21,121 23,200 18,211 28,021 20,500 48,773 48,521 66,732 89,932 91,968 (11) (38) 15 53 (61) 1 (49) (60) (7) 8 (128) 27,641 21,083 23,215 18,264 27,960 20,501 48,724 48,461 66,725 89,940 91,840
Total revenues 69,815 68,773 220,129 217,870 78,164 71,499 75,066 68,511 79,093 70,260 149,663 149,353 217,864 292,930 283,616 789 (138) 95 262 (161) (95) 651 (256) 6 101 (281) 78,953 71,361 75,161 68,773 78,932 70,165 150,314 149,097 217,870 293,031 283,335
Operating expenses:                                                                          
General and administrative (9,310) (8,720) (27,217) (27,124)     10,199 8,411 8,645     18,256 26,667 36,866       (457) 309 148     148 457         9,742 8,720 8,793     18,404 27,124 36,866  
Total operating expenses 65,514 61,643 202,760 195,055     67,673 61,334 67,632     133,264 194,598 262,271       (457) 309 148     148 457         67,216 61,643 67,780     133,412 195,055 262,271  
Income from operations 4,301 7,130 17,369 22,815 8,999 3,418 7,393 7,177 11,461 4,628 12,417 16,089 23,266 30,659 36,997 789 (138) 552 (47) (309) (95) 651 (404) (451) 101 (281) 9,788 3,280 7,945 7,130 11,152 4,533 13,068 15,685 22,815 30,760 36,716
Gains (losses) on investments, net 18 755 (84) 898 (51) (51) (739) 147 84 59 (102) 143 290 (449) 1,018 149 (149) (65) 608          608 543 (1,417) 98 (200) (804) 755 84 59 (102) 143 898 94 (399)
Income before income taxes 4,248 8,242 17,845 24,609 9,203 3,743 7,058 7,681 11,675 5,096 12,946 16,771 24,452 31,510 38,645 938 (287) 487 561 (309) (95) 651 (404) 157 644 (1,698) 10,141 3,456 7,545 8,242 11,366 5,001 13,597 16,367 24,609 32,154 36,947
Income tax provision 1,813 (2,468) 7,056 3,191 3,581 1,402 2,807 (2,692) 3,906 1,915 4,983 5,821 3,129 5,936 15,635 375 (115) 195 224 (124) (38) 260 (162) 62 257 (679) 3,956 1,287 3,002 (2,468) 3,782 1,877 5,243 5,659 3,191 6,193 14,956
Net income $ 2,435 $ 10,710 $ 10,789 $ 21,418 $ 5,622 $ 2,341 $ 4,251 $ 10,373 $ 7,769 $ 3,181 $ 7,963 $ 10,950 $ 21,323 $ 25,574 $ 23,010 $ 563 $ (172) $ 292 $ 337 $ (185) $ (57) $ 391 $ (242) $ 95 $ 387 $ (1,019) $ 6,185 $ 2,169 $ 4,543 $ 10,710 $ 7,584 $ 3,124 $ 8,354 $ 10,708 $ 21,418 $ 25,961 $ 21,991
Basic income per common share $ 0.12 $ 0.48 $ 0.51 $ 0.95 $ 0.26 $ 0.10 $ 0.19 $ 0.46 $ 0.34 $ 0.14 $ 0.37 $ 0.48 $ 0.94 $ 1.14 $ 1.02 $ 0.03   $ 0.01 $ 0.02     $ 0.01 $ (0.01) $ 0.01 $ 0.01 $ (0.05) $ 0.29 $ 0.10 $ 0.20 $ 0.48 $ 0.34 $ 0.14 $ 0.38 $ 0.47 $ 0.95 $ 1.15 $ 0.97
Diluted income per common share $ 0.12 $ 0.47 $ 0.50 $ 0.93 $ 0.26 $ 0.10 $ 0.19 $ 0.45 $ 0.34 $ 0.14 $ 0.36 $ 0.47 $ 0.93 $ 1.12 $ 0.99 $ 0.02   $ 0.01 $ 0.02 $ (0.01) $ (0.01) $ 0.02 $ (0.01)   $ 0.01 $ (0.04) $ 0.28 $ 0.10 $ 0.20 $ 0.47 $ 0.33 $ 0.13 $ 0.38 $ 0.46 $ 0.93 $ 1.13 $ 0.95