Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value Measurements Recurring, Other Noncurrent Assets, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Retirement plan asset	$ 2,010	$ 1,908
Quoted Prices in Active Markets Identical Assets (Level 1)
Derivatives Fair Value [Line Items]
Retirement plan asset	$ 2,010	$ 1,908