Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Level 2, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Level 2
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Deferred Compensation Liability	$ (12,321)	$ (12,677)