Principal Payments for All Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Maturities of Long-term Debt [Abstract]    
2014 $ 5,437  
2015 4,940  
2016 4,277  
2017 140,090  
2018 401,202  
Thereafter     
Total $ 555,946 $ 567,037