Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Amount of deferred tax liabilities offset for presentation purposes	$ 33.4	$ 35.5
Cumulative net operating loss carry forwards, amount	$ 47.8
Cumulative net operating loss carry forwards, expiration year	2033
Federal foreign tax carryforwards, amount	$ 7.7	3.8
Federal foreign tax credit carryforwards, expiration year	2025
Deferred tax assets	$ 219.4	131.0
Valuation allowance established by partnership	14.1	29.7
Deferred tax liabilities	103.5	112.2
Income tax expense	2.1	76.8	$ 96.2
Liability for uncertain tax positions	20.3	18.7
Accrued interest and penalties associated with uncertain tax positions	7.1	$ 4.9
Uncertain tax positions that would reduce effective tax rate, if recognized	$ 16.9
Number of years federal income tax returns are subject to examination	3 years
Period in which significant changes in unrecognized tax benefits are not expected	next twelve months
U.S. Federal
Income Taxes [Line Items]
Income tax examination, start year	2012
Income tax examination, end year	2014
State and Local
Income Taxes [Line Items]
Income tax examination, start year	2011
Income tax examination, end year	2014
Foreign
Income Taxes [Line Items]
Income tax examination, start year	2008
Income tax examination, end year	2014