Intangible Assets (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Balance, beginning of year			$ 2,050
Increase in intangibles due to acquisition	[1]	$ 2,872
Amortization		(376)
Transfer to held-for-sale			$ (2,050)
Balance, end of year		$ 2,496

[1] The increase in goodwill and intangible assets relates to the acquisition of a Field Marketing Office (FMO). See note 19 for further details regarding the acquisition.