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Financial Instruments (Cash and Available for Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Value by Significant Investment Category) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 88,372	$ 76,927
Unrealized Losses	(107)	(396)
Accrued Interest	287	317
Estimated Fair Value	88,552	76,848
Cash & Cash Equivalents	63,532	52,436	$ 58,610	$ 42,037
Investment Securities	25,020	24,412
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	33,306	52,005
Estimated Fair Value	33,306	52,005
Cash & Cash Equivalents	33,306	52,005
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	34,282	3,086
Unrealized Losses	(36)	(48)
Accrued Interest	9	9
Estimated Fair Value	34,255	3,047
Cash & Cash Equivalents	30,226	431
Investment Securities	4,029	2,616
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	30,000
Estimated Fair Value	30,000
Cash & Cash Equivalents	30,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	226	431
Estimated Fair Value	226	431
Cash & Cash Equivalents	226	431
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	4,056	2,655
Unrealized Losses	(36)	(48)
Accrued Interest	9	9
Estimated Fair Value	4,029	2,616
Investment Securities	4,029	2,616
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	20,784	21,836
Unrealized Losses	(71)	(348)
Accrued Interest	278	308
Estimated Fair Value	20,991	21,796
Investment Securities	$ 20,991	$ 21,796

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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