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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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 76,927	$ 67,237
Unrealized Gains		372
Unrealized Losses	(396)	(583)
Accrued Interest	317	83
Estimated Fair Value	76,848	67,109
Cash & Cash Equivalents	52,436	42,037	$ 24,459	$ 36,382
Investment Securities	24,412	25,072
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	52,005	38,276
Estimated Fair Value	52,005	38,276
Cash & Cash Equivalents	52,005	38,276
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	3,086	20,172
Unrealized Gains		308
Unrealized Losses	(48)	(539)
Accrued Interest	9	17
Estimated Fair Value	3,047	19,958
Cash & Cash Equivalents	431	3,761
Investment Securities	2,616	16,197
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	431	3,761
Estimated Fair Value	431	3,761
Cash & Cash Equivalents	431	3,761
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		9,654
Unrealized Gains		37
Unrealized Losses		(444)
Estimated Fair Value		9,247
Investment Securities		9,247
Fair Value, Inputs, Level 1 [Member] | Corporate Equity Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		1,332
Unrealized Gains		246
Unrealized Losses		(76)
Estimated Fair Value		1,502
Investment Securities		1,502
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	2,655	5,425
Unrealized Gains		25
Unrealized Losses	(48)	(19)
Accrued Interest	9	17
Estimated Fair Value	2,616	5,448
Investment Securities	2,616	5,448
Fair Value, Inputs, Level 2 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	21,836	8,789
Unrealized Gains		64
Unrealized Losses	(348)	(44)
Accrued Interest	308	66
Estimated Fair Value	21,796	8,875
Investment Securities	21,796	8,875
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	21,836	2,735
Unrealized Gains		42
Unrealized Losses	(348)	(3)
Accrued Interest	308	20
Estimated Fair Value	21,796	2,794
Investment Securities	$ 21,796	2,794
Fair Value, Inputs, Level 2 [Member] | Corporate Bonds
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		6,054
Unrealized Gains		22
Unrealized Losses		(41)
Accrued Interest		46
Estimated Fair Value		6,081
Investment Securities		$ 6,081

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