The Company and Summary of Significant Accounting Policies - Fair Value of Financial Liabilities and Assets Measured on a Recurring Basis (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Assets (Liabilities) at fair value
Nonqualified deferred compensation asset	$ 5,581	$ 4,534	$ 4,410
Nonqualified deferred compensation liability	(5,581)	(4,534)	(4,410)
Designated derivatives liability	(487)	(832)	(550)
Contingent consideration for acquisition of business	(26,000)	(30,000)	(48,000)
Level 1
Assets (Liabilities) at fair value
Nonqualified deferred compensation asset	5,581	4,534	4,410
Nonqualified deferred compensation liability	(5,581)	(4,534)	(4,410)
Level 2
Assets (Liabilities) at fair value
Designated derivatives liability	(487)	(832)	(550)
Level 3
Assets (Liabilities) at fair value
Contingent consideration for acquisition of business	$ (26,000)	$ (30,000)	$ (48,000)