Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt, total	$ 338,827	$ 338,461
Less current maturities	17,868	2,319
Long-term debt, noncurrent	320,959	336,142
Parent Company [Member]
Debt Instrument [Line Items]
Long-term debt, total	299,120	299,720
Parent Company [Member] | 8% Unsecured Notes Due December 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, total	173,578	173,578
Parent Company [Member] | 7.625% Unsecured Notes Due March 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, total	116,880	116,880
Parent Company [Member] | Capitalized Leases and Other [Member]
Debt Instrument [Line Items]
Long-term debt, total	8,662	9,262
Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term debt, total	39,707	38,741
Subsidiaries [Member] | 4.27% to 6.15% Unsecured Notes Due in 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, total	15,560	29,321
Subsidiaries [Member] | 4.27% to 4.70% Unsecured Notes Due in 2015 [Member]
Debt Instrument [Line Items]
Long-term debt, total	8,554	3,118
Subsidiaries [Member] | 4.00% and 6.15% Unsecured Notes Due in 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, total	11,036
Subsidiaries [Member] | 5.42% and 5.61% Secured Notes Due in 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 4,557	$ 6,302