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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	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 98,823	$ 76,927
Unrealized Losses	(268)	(396)
Accrued Interest	279	317
Estimated Fair Value	98,834	76,848
Cash & Cash Equivalents	75,077	52,436	$ 42,037	$ 24,459
Investment Securities	23,757	24,412
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	28,630	52,005
Estimated Fair Value	28,630	52,005
Cash & Cash Equivalents	28,630	52,005
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	51,789
Unrealized Losses	(67)
Accrued Interest	13
Estimated Fair Value	51,735
Cash & Cash Equivalents	46,447
Investment Securities	5,288
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	45,000
Estimated Fair Value	45,000
Cash & Cash Equivalents	45,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	1,447	431
Estimated Fair Value	1,447	431
Cash & Cash Equivalents	1,447	431
Fair Value, Inputs, Level 1 [Member] | Corporate Equity Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		3,086
Unrealized Losses		(48)
Accrued Interest		9
Estimated Fair Value		3,047
Cash & Cash Equivalents		431
Investment Securities		2,616
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	5,342	2,655
Unrealized Losses	(67)	(48)
Accrued Interest	13	9
Estimated Fair Value	5,288	2,616
Investment Securities	5,288	2,616
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	18,404	21,836
Unrealized Losses	(201)	(348)
Accrued Interest	266	308
Estimated Fair Value	18,469	21,796
Investment Securities	$ 18,469	$ 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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