Long Term Debt - Schedule of Commitment Fees Incurred and Interest Expense Recorded (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Debt Disclosure [Abstract]    
Interest and commitment fees incurred $ 13,457 $ 14,064
Capitalized interest, commitment fees, and letter of credit fees (1,283) (419)
Letter of credit fees 1,052 767
Amortization of financing costs 1,395 2,230
Interest expense $ 14,621 $ 16,642