Investments - Schedule of Other Long-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment [Line Items]
Other long-term investments	$ 13,207	$ 18,539
Mortgage Loans, At Cost [Member]
Investment [Line Items]
Other long-term investments	0	514
Investment Real Estate, At Depreciated Cost [Member]
Investment [Line Items]
Other long-term investments	203	2,816
Low-Income Housing Interests [Member]
Investment [Line Items]
Other long-term investments	7,589	9,875
Other [Member]
Investment [Line Items]
Other long-term investments	$ 5,415	$ 5,334