Goodwill and Other Intangible - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Other Intangible Asset [Line Items]
Amortization of acquired intangible assets	$ 104	$ 108	$ 73
Amortization expenses of intangible assets, 2014	101
Amortization expenses of intangible assets, 2015	101
Amortization expenses of intangible assets, 2016	94
Amortization expenses of intangible assets, 2017	92
Amortization expenses of intangible assets, 2018	84
Amortization expenses of intangible assets, After 2018	$ 485
Weighted Average [Member]
Schedule Of Goodwill And Other Intangible Asset [Line Items]
Weighted average useful life of intangible assets	6 years