Earnings Per Common Share Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																			12 Months Ended
	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, 2010	Sep. 30, 2010	Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share Disclosure [Line Items]
Net earnings	$ 34,200	$ 36,700	[1]	$ 21,700	[2]	$ 26,400	$ 34,200	[3]	$ 27,500	$ 30,300	[4]	$ 21,400	[5]	$ 24,800	$ 27,000	$ 11,100	[6]	$ 322,500	[7]	$ 118,985	$ 113,430	$ 385,405
Weighted-average common shares outstanding, basic																				40,167	46,684	49,140
Shares issued on exercise of dilutive options																				4,576	5,537	8,178
Shares purchased with assumed proceeds of options and unearned restricted shares																				(2,797)	(3,448)	(5,370)
Shares contingently issuable																				1	4	9
Weighted-average common shares outstanding, diluted																				41,947	48,777	51,957
Net earnings per common share, diluted	$ 0.85	$ 0.90	[1]	$ 0.51	[2]	$ 0.60	$ 0.76	[3]	$ 0.58	$ 0.60	[4]	$ 0.41	[5]	$ 0.47	$ 0.52	$ 0.21	[6]	$ 6.26	[7]	$ 2.84	$ 2.33	$ 7.42
Anti-dilutive options excluded from calculation of weighted-average common shares outstanding, diluted																				3,308	3,263	1,400

[1] Includes $5.0 million tax benefit, or $0.12 per common share, diluted, resulting from the expiration of certain tax reserves

[2] Includes $4.7 million, net of tax, or $0.11 per common share, diluted, in goodwill impairment charges (for further information, see Note 2, Goodwill and Other Intangible Assets) and $6.0 million, net of tax, or $0.14 per common share, diluted, in restructuring and other postemployment charges (for further information, see Note 13, Segment Reporting)

[3] Includes $4.3 million, net of tax, or $0.09 per common share, diluted, in intangible asset write-offs (see Note 2, Goodwill and Other Intangible Assets, for further information) and $4.2 million, net of tax, or $0.08 per common share, diluted, in restructuring and other postemployment charges

[4] Includes $3.4 million loss on extinguishment of debt and related charges, net of tax, or $0.07 per common share, diluted, related to the replacement and termination of our Prior Senior Secured Credit Facility (for further information, see Note 3, Long-Term Debt)

[5] Includes $8.2 million loss on extinguishment of debt, net of tax, or $0.16 per common share, diluted, related to our cash tender offer, consent solicitation and redemption of our outstanding 2015 Notes (for further information, see Note 3, Long-Term Debt)

[6] Includes $14.7 million loss on extinguishment of debt, net of tax, or $0.28 per common share, diluted, related to our tender offer and open market repurchases of $297.8 million aggregate principal amount of our 8¼% Senior Notes due 2015 (for further information, see Note 3, Long-Term Debt)

[7] Includes $301.4 million gain on litigation settlement, net of tax and related payments, or $5.85 per common share, diluted, associated with the News America litigation settlement proceeds (for further information, see Note 6, Gain from Litigation Settlement)