Long-Term Debt (Aggregate Contractual Future Principal Payments by Calendar Year on Long-Term Debt) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Long-Term Debt [Abstract]
2015	$ 3,649	[1]
2016	101,537
2017	660,437
2018	920,918
2019	175,411
Thereafter	117,613
Total debt	$ 1,979,565		$ 2,072,975

[1] The Company has recorded the 2015 Notes in the 2018 category in the table above as the Company has the intent and ability to redeem the 2015 Notes on October 1, 2015 using borrowings under its credit agreement.