Investments - Schedule of Other Long-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Other long-term investments	$ 36,803	$ 10,449	[1]
Investment in Limited Partnership [Member]
Investment [Line Items]
Other long-term investments	31,409	3,236
Low-Income Housing Interests [Member]
Investment [Line Items]
Other long-term investments	3,767	5,370
Other [Member]
Investment [Line Items]
Other long-term investments	$ 1,627	$ 1,843

[1] Certain balances were adjusted to give effect to discontinued operations as described in Note 1—Significant Accounting Policies.