Components of Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Component of Other Expense, Nonoperating [Line Items]
Interest on borrowings and related fees	$ 14,156	$ 13,581	$ 42,462	$ 37,448
Accretion on original issue discount	351	315	1,025	3,103
Amortization of debt issuance costs	706	747	2,082	2,709
Capitalized interest	(234)	(437)	(732)	(1,427)
Interest expense	$ 14,979	$ 14,206	$ 44,837	$ 41,833