CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 89,819	$ 191,603
Available-for-sale securities	4,883	5,066
Accounts receivable, net	178,430	153,339
Prepaid expenses	21,946	21,905
Deferred income taxes, net	10,397	3,818
Income taxes receivable	45,975	36,675
Other current assets	39,109	41,248
Total current assets	390,559	453,654
Noncurrent assets:
Fixed assets, net	154,084	119,411
Intangible assets, net	520,935	226,424
Goodwill	1,247,459	709,944
Deferred income taxes, net		10,480
Other assets	47,299	21,193
Total assets	2,360,336	1,541,106
Current liabilities:
Accounts payable and accrued liabilities	187,648	162,992
Acquisition related liabilities		250
Short-term debt and current portion of long-term debt	195,263	5,554
Pension and postretirement benefits, current	1,734	4,012
Fees received in advance	200,705	176,842
Total current liabilities	585,350	349,650
Noncurrent liabilities:
Long-term debt	1,266,162	1,100,332
Pension benefits	38,655	109,161
Postretirement benefits	2,627	18,587
Deferred income taxes, net	133,761
Other liabilities	78,190	61,866
Total liabilities	2,104,745	1,639,596
Commitments and contingencies
Stockholders' equity (deficit):
Unearned KSOP contributions	(483)	(691)
Additional paid-in capital	1,044,746	874,808
Treasury stock, at cost, 376,275,965 and 379,717,811 shares, respectively	(1,605,376)	(1,471,042)
Retained earnings	905,727	576,585
Accumulated other comprehensive losses	(89,160)	(78,287)
Total stockholders' equity (deficit)	255,591	(98,490)
Total liabilities and stockholders' equity (deficit)	2,360,336	1,541,106
Verisk Class A [Member]
Stockholders' equity (deficit):
Verisk Class A common stock, $.001 par value; 1,200,000,000 shares authorized; 544,003,038 shares issued and 167,727,073 and 164,285,227 outstanding, respectively	$ 137	$ 137