Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Disclosure Summary Of Property And Equipment [Abstract]
Furniture, fixtures, and equipment	$ 145,746	$ 115,751
Buildings	64,452	55,682
Corporate aircraft	11,334	11,334
Leasehold improvements	22,663	17,781
Land	15,004	14,841
Construction in progress	5,808	4,684
Less accumulated depreciation	(115,156)	(93,243)
Net property and equipment	$ 149,851	$ 126,830