Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Assets:
Derivative financial instruments	$ 347	[1]
Liabilities:
Long-term obligations	1,671,114	[2]	1,862,091	[3]
Derivative financial instruments			1,880	[4]
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]
Assets:
Derivative financial instruments		[1]
Liabilities:
Long-term obligations		[2]		[3]
Derivative financial instruments				[4]
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Derivative financial instruments	347	[1]
Liabilities:
Long-term obligations	1,401,487	[2]	1,445,774	[3]
Derivative financial instruments			1,880	[4]
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Derivative financial instruments		[1]
Liabilities:
Long-term obligations	269,627	[2]	416,317	[3]
Derivative financial instruments				[4]

[1] Reflected at fair value in the unaudited condensed consolidated balance sheet as other assets of $347. There were no transfers between Levels 1, 2 or 3 during the three or nine months ended September 30, 2013.

[2] Reflected at carrying value in the unaudited condensed consolidated balance sheet as current maturities on long-term debt of $14,050 and long-term debt of $1,629,489 as of September 30, 2013.

[3] Reflected at carrying value in the unaudited condensed consolidated balance sheet as current maturities on long-term debt of $21,330 and long-term debt of $1,802,644 as of December 31, 2012

[4] Reflected at fair value in the unaudited condensed consolidated balance sheet as other liabilities of $1,880 at December 31, 2012.