Financial Instruments and Fair Value Measurements - Summary of Change in Fair Value of Level Three Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gain (loss) recognized in other expenses	$ (9)	$ (6)	$ (12)	$ 173
Indemnification Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	971	2,947	1,428	3,586
Payments received	(839)	(839)	(1,299)	(1,299)
Unrealized gain (loss) recognized in other expenses	9	6	12	(173)
Ending balance	$ 141	$ 2,114	$ 141	$ 2,114