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Segment Information (Schedule of Assets by Geographic Region)(Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total assets	$ 954,450	$ 875,201
All other [Member]
Total assets	31,274	32,803
United Kingdom [Member]
Total assets	114,149	104,989
United States [Member]
Total assets	$ 809,027	$ 737,409

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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