Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Extremity Fixation Restructuring Plan [Member]
Other Current Liabilities [Line Items]
Pre-tax restructuring expense	$ 3.3
Cumulative costs incurred to date on restructuring	3.3
Accrued in other current liabilities related to restructuring	0.7	$ 1.5
Restructuring costs incurred	1.3
Payments for restructuring	2.1
U.S. Restructuring Plan [Member]
Other Current Liabilities [Line Items]
Accrued in other current liabilities related to restructuring	1.1
Payments for restructuring	0.6
U.S. Restructuring Plan [Member] | Operating Expense [Member]
Other Current Liabilities [Line Items]
Pre-tax restructuring expense	$ 1.7