Reconciliation of Total Segment Assets to Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Total segment assets	$ 3,239,540	$ 3,226,103	$ 2,944,744
Other assets	81,542	67,440
Total assets	$ 3,321,082	$ 3,293,543