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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transactions
Related Party Transaction [Line Items]
Legal fees and expenses	$ 2.9	$ 3.4	$ 2.7
Legal fees and reimbursable expenses
Related Party Transaction [Line Items]
Legal fees and reimbursable expense, payable	$ 0.5	$ 0.8

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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