Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, Total	$ 297,921	$ 301,046
Less: unamortized debt issuance costs	909	994
Long-term debt, including current maturities	297,012	300,052
Long-term debt, including current maturities	297,012	300,052
Less: current maturities	600	2,115
Long-term debt, noncurrent	296,412	297,937
Parent Company [Member]
Debt Instrument [Line Items]
Long-term debt, Total	297,921	298,520
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	$ 7,463	8,062
Subsidiaries [Member] | 5.46% and 5.63% Secured Notes Due in 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, Total		$ 2,526