Corporate Borrowings And Capital Lease Obligations (Detail) - Offsetting Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Gross Amounts Of Recognized Assets Liabilities [Member]
Offsetting Assets and Liabilities [Line Items]
Investment in bonds	$ 7,000	$ 7,000
Capital lease obligations	(7,000)	(7,000)
Gross Amounts Off Set In The Balance Sheet [Member]
Offsetting Assets and Liabilities [Line Items]
Investment in bonds	7,000	7,000
Capital lease obligations	(7,000)	(7,000)
Net Amounts Of Assets Liabilities Presented In The Balance Sheet [Member]
Offsetting Assets and Liabilities [Line Items]
Investment in bonds	0	0
Capital lease obligations	$ 0	$ 0