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Acquisition (Pro Forma Financial Information) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2010
Pro Forma Financial Information [Line Items]                        
Operating revenues $ 72,524 $ 247,080 $ 235,444 $ 238,565 $ 229,052 $ 226,134 $ 225,026 $ 226,483 $ 223,298 $ 950,141 $ 900,941 $ 662,901
Cost of services 20,986 74,191 68,350 73,243 72,291 69,121 68,968 68,840 70,218 288,075 277,147 198,626
Selling, general and administrative 17,481 57,172 62,973 57,602 55,436 54,509 53,724 53,321 51,418 233,183 212,972 190,244
Restructuring 26       22 29 (125) 1,002 (40) (4,431) (51) 3,594 8,896
Amortization of intangible assets 5,564 15,421 15,959 15,959 15,959 16,268 16,422 16,423 16,692 63,298 65,805 41,599
Depreciation and amortization of property, equipment and leasehold improvements 1,798 4,989 4,633 4,662 4,416 4,478 4,669 5,168 5,110 18,700 19,425 17,413
Total operating expenses 45,855 151,773 151,915 151,444 148,073 144,501 142,781 143,792 147,869 603,205 578,943 456,778
Operating income 26,669 95,307 83,529 87,121 80,979 81,633 82,245 82,691 75,429 346,936 321,998 206,123
Other expense (income), net 6,113 6,992 7,935 29,860 12,740 11,505 11,946 13,049 22,085 57,527 58,585 52,632
Income before provision for income taxes 20,556 88,315 75,594 57,261 68,239 70,128 70,299 69,642 53,344 289,409 263,413 153,491
Provision for income taxes 6,732 33,863 27,320 19,715 24,273 25,642 20,512 23,982 19,823 105,171 89,959 61,321
Net income 13,824 54,452 48,274 37,546 43,966 44,486 49,787 45,660 33,521 184,238 173,454 92,170
Earnings per diluted common share $ 0.11 $ 0.44 $ 0.39 $ 0.30 $ 0.35 $ 0.36 $ 0.40 $ 0.37 $ 0.27 $ 1.48 $ 1.41 $ 0.81
RiskMetrics [Member]
                       
Pro Forma Financial Information [Line Items]                        
Operating revenues                       816,419
Cost of services                       272,939
Selling, general and administrative                       199,290
Restructuring                       8,896
Amortization of intangible assets                       64,477
Depreciation and amortization of property, equipment and leasehold improvements                       21,660
Total operating expenses                       567,262
Operating income                       249,157
Other expense (income), net                       71,430
Income before provision for income taxes                       177,727
Provision for income taxes                       66,896
Net income                       $ 110,831
Earnings per diluted common share                       $ 0.91