Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value Disclosures [Abstract]
Derivative financial instruments	$ 347	[1]
Current maturities on long-term debt	14,050		21,330
Long-term debt	1,629,489		1,802,644
Derivative financial instruments			$ 1,880	[2]

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