General - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Mutual Funds [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of assets	$ 758	$ 3,275
Deferred Compensation [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of liabilities	758	3,275
Level 1 [Member] | Mutual Funds [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of assets	758	3,275
Level 1 [Member] | Deferred Compensation [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of liabilities
Level 2 [Member] | Mutual Funds [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of assets
Level 2 [Member] | Deferred Compensation [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of liabilities	758	3,275
Level 3 [Member] | Mutual Funds [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of assets
Level 3 [Member] | Deferred Compensation [Member]
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Fair value of liabilities