Fair Value Measurements (Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investment	$ 21,145	$ 21,094
Available for sale securities	5,001	4,513
Contingent consideration	(4,705)
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investment	21,145	21,094
Available for sale securities	5,001	4,513
Contingent consideration	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investment	0	0
Available for sale securities	0	0
Contingent consideration	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investment	0	0
Available for sale securities	0	$ 0
Contingent consideration	$ (4,705)