Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Current deferred tax assets	$ 34.0	$ 14.7
Long term deferred tax assets	10.1	7.9
Long term deferred tax liabilities	193.0	178.0
Acquired goodwill deductible for tax purposes, amortization period	15 years
Valuation allowance, deferred tax asset, change in amount	0.5
Net operating loss carryforwards	0.4
Net operating loss carryforwards, expiration year	2021
Unrecognized tax benefits, income tax penalties and interest accrued	4.8	4.5
Unrecognized tax benefits, net of associated tax assets and excluding federal tax benefit of state taxes, interest and penalties	49.5	41.0
Unrecognized tax benefits would impact effective tax rate	32.8	33.0
Undistributed earnings from foreign earnings	62.7
Deferred tax liability related to undistributed earnings from foreign earnings If the earnings of foreign subsidiaries were not indefinitely reinvested	21.9
Other Asset
Income Taxes [Line Items]
Asset associated with uncertain tax position	16.0	7.0
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards	6.1
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2014
State and Local Jurisdiction | Maximum
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2024
Deferred Tax Asset, Operating Loss Carryforwards, Domestic
Income Taxes [Line Items]
Valuation allowance, amount	0.4
Deferred Tax Asset, Operating Loss Carryforwards, Foreign
Income Taxes [Line Items]
Valuation allowance, amount	8.2
Deferred Tax Asset, Operating Loss and Tax Credit Carryforwards, State and Local
Income Taxes [Line Items]
Valuation allowance, amount	0.7
Deferred Tax Asset, Tax Credit Carryforwards, Foreign
Income Taxes [Line Items]
Valuation allowance, amount	$ 3.1