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Available-For-Sale Securities Adjusted cost (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 79,330	$ 67,237
Unrealized Gains	78	372
Unrealized Losses	0	(583)
Accrued Interest	177	83
Estimated Fair Value	79,585	67,109
Cash & Cash Equivalents	58,610	42,037	$ 37,145	$ 24,459
Investment Securities	20,975	25,072
Cash
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	54,388	38,276
Unrealized Gains	0	0
Unrealized Losses	0	0
Accrued Interest	0	0
Estimated Fair Value	54,388	38,276
Cash & Cash Equivalents	54,388	38,276
Investment Securities	0	0
Fair Value, Inputs, Level 1
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	5,464	20,172
Unrealized Gains	6	308
Unrealized Losses	0	(539)
Accrued Interest	9	17
Estimated Fair Value	5,479	19,958
Cash & Cash Equivalents	4,222	3,761
Investment Securities	1,257	16,197
Fair Value, Inputs, Level 1 | Money Market Accounts
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	4,222	3,761
Unrealized Gains	0	0
Unrealized Losses	0	0
Accrued Interest	0	0
Estimated Fair Value	4,222	3,761
Cash & Cash Equivalents	4,222	3,761
Investment Securities	0	0
Fair Value, Inputs, Level 1 | Mutual Funds
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		9,654
Unrealized Gains		37
Unrealized Losses		(444)
Accrued Interest		0
Estimated Fair Value		9,247
Cash & Cash Equivalents		0
Investment Securities		9,247
Fair Value, Inputs, Level 1 | Corporate Equity Securities
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		1,332
Unrealized Gains		246
Unrealized Losses		(76)
Accrued Interest		0
Estimated Fair Value		1,502
Cash & Cash Equivalents		0
Investment Securities		1,502
Fair Value, Inputs, Level 1 | Government & Agency Securities
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	1,242	5,425
Unrealized Gains	6	25
Unrealized Losses	0	(19)
Accrued Interest	9	17
Estimated Fair Value	1,257	5,448
Cash & Cash Equivalents	0	0
Investment Securities	1,257	5,448
Fair Value, Inputs, Level 2
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	19,478	8,789
Unrealized Gains	72	64
Unrealized Losses	0	(44)
Accrued Interest	168	66
Estimated Fair Value	19,718	8,875
Cash & Cash Equivalents	0	0
Investment Securities	19,718	8,875
Fair Value, Inputs, Level 2 | Municipal Bonds
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	19,478	2,735
Unrealized Gains	72	42
Unrealized Losses	0	(3)
Accrued Interest	168	20
Estimated Fair Value	19,718	2,794
Cash & Cash Equivalents	0	0
Investment Securities	$ 19,718	2,794
Fair Value, Inputs, Level 2 | 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
Cash & Cash Equivalents		0
Investment Securities		$ 6,081

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

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