Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUE:
Management and other													$ 1,757,221	$ 1,722,139	$ 1,660,760
Rental													2,664	2,204	2,557
Revenue	436,861	444,853	442,866	435,305	437,082	[1]	432,137	[1]	429,944	[1]	425,180	[1]	1,759,885	1,724,343	1,663,317
EXPENSES:
Operating													1,252,184	1,190,873	1,151,163
General and administrative													88,935	91,227	84,148
Depreciation and amortization													113,933	108,216	103,710
Costs and Expenses													1,455,052	1,390,316	1,339,021
OPERATING INCOME (LOSS)	80,516	79,888	74,885	69,544	82,377	[1]	80,905	[1]	87,100	[1]	83,645	[1]	304,833	334,027	324,296
OTHER (INCOME) EXPENSE:
Interest expense, net													58,363	72,940	71,127
Expenses associated with debt refinancing transactions													2,099
Other (income) expense													(338)	304	41
Total non-operating expense (income)													60,124	73,244	71,168
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES													244,709	260,783	253,128
Income tax (expense) benefit													(87,586)	(97,017)	(94,765)
INCOME (LOSS) FROM CONTINUING OPERATIONS													157,123	163,766	158,363
Loss from discontinued operations, net of taxes					(841)	[1]	(107)	[1]	(198)	[1]	(110)	[1]	(362)	(1,256)	(1,170)
NET INCOME	45,408	42,339	37,334	31,680	40,522		39,240		42,418		40,330		156,761	162,510	157,193
Parent
REVENUE:
Management and other													1,408,613
Rental													2,664
Revenue													1,411,277
EXPENSES:
Operating													943,803
General and administrative													70,792
Depreciation and amortization													74,452
Costs and Expenses													1,089,047
OPERATING INCOME (LOSS)													322,230
OTHER (INCOME) EXPENSE:
Interest expense, net													57,174
Expenses associated with debt refinancing transactions													2,099
Other (income) expense													16
Total non-operating expense (income)													59,289
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES													262,941
Income tax (expense) benefit													(93,870)
INCOME (LOSS) FROM CONTINUING OPERATIONS													169,071
Loss from equity in subsidiaries													(12,310)
NET INCOME													156,761
Combined Subsidiary Guarantors
REVENUE:
Management and other													366,199
Revenue													366,199
EXPENSES:
Operating													325,972
General and administrative													18,143
Depreciation and amortization													39,481
Costs and Expenses													383,596
OPERATING INCOME (LOSS)													(17,397)
OTHER (INCOME) EXPENSE:
Interest expense, net													1,189
Other (income) expense													(31)
Total non-operating expense (income)													1,158
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES													(18,555)
Income tax (expense) benefit													6,284
INCOME (LOSS) FROM CONTINUING OPERATIONS													(12,271)
Loss from discontinued operations, net of taxes													(362)
NET INCOME													(12,633)
Consolidating Adjustments
REVENUE:
Management and other													(17,591)
Revenue													(17,591)
EXPENSES:
Operating													(17,591)
Costs and Expenses													(17,591)
OTHER (INCOME) EXPENSE:
Other (income) expense													(323)
Total non-operating expense (income)													(323)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES													323
INCOME (LOSS) FROM CONTINUING OPERATIONS													323
Loss from equity in subsidiaries													12,310
NET INCOME													$ 12,633

[1] The amounts presented for the four quarters of 2011 are not equal to the same amounts previously reported in the respective reports on Form 10-Q and Form 10-K for each period as a result of discontinued operations. Below is a reconciliation to the previously reported amounts in Form 10-Q.