Long-Term Debt (Aggregate Contractual Future Principal Payments by Calendar Year on Long-Term Debt) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Long-Term Debt [Abstract]
2016	[1]	$ 2,127
2017		1,069
2018		66,442
2019		175,955
2020		1,290,460
Thereafter		621,232
Total debt		$ 2,157,285	$ 1,979,565

[1] The Company has recorded the 2016 Notes in the 2020 category in the table above as the Company has the intent and ability to redeem the 2016 Notes on April 1, 2016 using borrowings under its credit agreement.