Income Taxes - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Deferred tax assets, domestic		$ 5.2	$ 5.5
Deferred income tax assets, net operating loss carryforwards		9.2	10.3
Valuation Allowance		1.8	6.8
Valuation Allowance, Deferred Tax Asset, Change in Amount		(5.0)	(0.2)	3.0
Decrease in deferred tax assets and the related valuation allowance		4.7
Discrete tax adjustment	4.5
Undistributed international earnings		106.2	78.2
Effective tax rate due by recognized tax benefits		0.3	0.3
Unrecognized tax benefits,interest and penalties		0.03	0.03
Minimum
Income Taxes [Line Items]
Deferred income tax assets, operating loss carryforwards expiration period		5
Tax returns examination statute of limitations period		3 years
Maximum
Income Taxes [Line Items]
Deferred income tax assets, operating loss carryforwards expiration period		15
Tax returns examination statute of limitations period		4 years
Switzerland
Income Taxes [Line Items]
Income tax holiday, aggregate dollar amount		$ 1.9	$ 1.5	$ 0.9
Income tax holiday, income tax benefits per share		$ 0.11	$ 0.09	$ 0.05