Other Liabilities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Other Liabilities [Line Items]
Renovation cost, incentive receivable	$ 16,062	[1]	$ 24,570	[1]

[1] Includes contractual amounts receivable related to the renovation of the Company's Stamford headquarters facility (see Property, equipment and leasehold improvements in Note 1 - Business and Significant Accounting Policies for additional description).