Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 148,000
Derivative financial instruments	0	71,000
Current maturities on long-term debt	14,050,000	14,050,000
Long-term debt	1,592,369,000	1,632,531,000
Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	148,000
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments		$ 71,000