Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	$ 27,871	$ 11,165
Available for sale securities	3,255	2,862
Contingent consideration		(9,043)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	27,871	11,165
Available for sale securities	3,255	2,862
Contingent consideration		0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	0	0
Available for sale securities	0	0
Contingent consideration		0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	0	0
Available for sale securities	0	0
Contingent consideration		$ (9,043)