Components of Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Component of Other Expense, Nonoperating [Line Items]
Interest on borrowings and related fees	$ 14,017	$ 10,747
Accretion on original issue discount	333	2,205
Amortization of debt issuance costs	682	1,067
Capitalized interest	(258)	(535)
Interest expense	$ 14,774	$ 13,484