Annual report pursuant to Section 13 and 15(d)

Employee Benefits - Additional Information (Detail)

v2.4.0.8
Employee Benefits - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
401(k) Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percent of participant contributions 75.00%    
Percent of employer contribution 8.00%    
Contributions $ 1,000,000 $ 1,000,000 $ 1,000,000
Deferred compensation plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Liabilities for the deferred compensation plan and interest $ 0 $ 0