Industry and Geographic Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Number of reportable segments | Segment	1
Customer Concentration Risk [Member] | Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 5.6	$ 5.5
Customer Concentration Risk [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	48.00%	48.00%	43.00%
Customer Concentration Risk [Member] | Sales [Member] | Non-U.S. Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	14.00%	13.00%	13.00%
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 12.0	$ 23.7
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%	10.00%