Goodwill and Intangible Assets (Narrative) (Detail) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2013 Segment	Dec. 31, 2012
Goodwill And Intangible Assets [Line Items]
Number of reporting units	11
Estimated cost of capital, minimum		9.50%
Estimated cost of capital, maximum		17.00%
Estimated cost of capital, weighted		11.00%
Hypothetical decrease to fair values of each reporting unit		10.00%
Net intangible assets	$ 114,590,000	$ 125,913,000
Intangibles with indefinite useful lives	30,700,000
Estimated amortization expense for intangible assets, current year	8,000,000
Estimated amortization expense for intangible assets, year 2013	14,100,000
Estimated amortization expense for intangible assets, year 2014	12,300,000
Estimated amortization expense for intangible assets, year 2015	11,600,000
Estimated amortization expense for intangible assets, year 2016	11,200,000
Estimated amortization expense for intangible assets, year 2017 and thereafter	$ 26,700,000