v2.4.0.8
Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 730,214 $ 735,701
Less current portion (25,246) (25,246)
Total 704,968 710,455
Secured Debt [Member]
   
Debt Instrument [Line Items]    
Long-term debt 172,182 180,229
Revolving Credit Facilities [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 558,032 $ 555,472