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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	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 95,522	$ 76,927
Unrealized Losses	(61)	(396)
Accrued Interest	273	317
Estimated Fair Value	95,734	76,848
Cash & Cash Equivalents	70,553	52,436	$ 57,120	$ 42,037
Investment Securities	25,181	24,412
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	45,374	52,005
Estimated Fair Value	45,374	52,005
Cash & Cash Equivalents	45,374	52,005
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	30,529	3,086
Unrealized Losses	(36)	(48)
Accrued Interest	35	9
Estimated Fair Value	30,528	3,047
Cash & Cash Equivalents	25,179	431
Investment Securities	5,349	2,616
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	25,000
Estimated Fair Value	25,000
Cash & Cash Equivalents	25,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	179	431
Estimated Fair Value	179	431
Cash & Cash Equivalents	179	431
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	5,350	2,655
Unrealized Losses	(36)	(48)
Accrued Interest	35	9
Estimated Fair Value	5,349	2,616
Investment Securities	5,349	2,616
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	19,619	21,836
Unrealized Losses	(25)	(348)
Accrued Interest	238	308
Estimated Fair Value	19,832	21,796
Investment Securities	$ 19,832	$ 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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