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Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases [Abstract]      
Rental expense $ 3.8 $ 3.7 $ 3.9
Future minimum rental commitments, 2014 2.6    
Future minimum rental commitments, 2015 1.8    
Future minimum rental commitments, 2016 1.5    
Future minimum rental commitments, 2017 1.2    
Future minimum rental commitments, 2018 1.2    
Future minimum rental commitments, Thereafter 9.9    
Future minimum rental commitments for capital leases, 2014 0.1    
Future minimum rental commitments for capital leases, 2015 $ 0.1    
Future minimum rental commitments for capital leases, 2016 Less than $.1 million    
Future minimum rental commitments for capital leases, 2017 Less than $.1 million    
Future minimum rental commitments for capital leases, 2018 Less than $.1 million    
Imputed interest maximum amount Less than $.1 million