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Income Taxes - Reconciliation of the Beginning and Ending Amount of Uncertain Tax Positions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 2,292 $ 709 $ 700
Additions based on tax positions related to the current year 97 131 217
Additions based on tax positions of prior years 255 1,937  
Reductions for tax positions of prior years (123) (485) (51)
Settlements (112)   (157)
Balance at end of year $ 2,409 $ 2,292 $ 709