Income Taxes (Detail 3) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Net deferred tax liabilities comprised
Loss reserves and accruals	$ 43,451,000		$ 34,208,000
Interest rate swaps	8,310,000		16,158,000
State net operating loss ("NOL") carryforwards	14,231,000		13,720,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	13,056,000		0
Deferred Tax Assets, Gross	98,234,000	2,300,000	87,855,000
Valuation allowance on state NOL	(28,310,000)		(11,393,000)
Deferred Tax Assets, Net of Valuation Allowance	69,924,000		76,462,000
Goodwill and intangible franchise rights	(141,384,000)		(92,900,000)
Depreciation expense	(39,285,000)		(33,371,000)
Other	(999,000)		(1,374,000)
Deferred Tax Liabilities, Gross	(199,997,000)		(150,020,000)
Deferred Tax Liabilities, Net, Noncurrent	216,200,000		173,100,000
Net deferred tax liability	(130,073,000)		(73,558,000)
2.25% Notes [Member]
Net deferred tax liabilities comprised
Convertible Debt	6,639,000		9,808,000
Discount on deferred tax assets	(7,846,000)		(10,647,000)
3.00% Notes [Member]
Net deferred tax liabilities comprised
Convertible Debt	12,547,000		13,961,000
Discount on deferred tax assets	$ (10,483,000)		$ (11,728,000)