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Income Tax Expense from Continuing Operations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Income Tax Expense Benefit [Line Items]
Total Current	$ 10,378,000us-gaap_CurrentIncomeTaxExpenseBenefit	$ 11,480,000us-gaap_CurrentIncomeTaxExpenseBenefit	$ 10,512,000us-gaap_CurrentIncomeTaxExpenseBenefit
Total Deferred	286,000us-gaap_DeferredIncomeTaxExpenseBenefit	428,000us-gaap_DeferredIncomeTaxExpenseBenefit	(598,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total Income Tax Expense from Continuing Operations	10,664,000us-gaap_IncomeTaxExpenseBenefit	11,908,000us-gaap_IncomeTaxExpenseBenefit	9,914,000us-gaap_IncomeTaxExpenseBenefit
Federal
Schedule Of Income Tax Expense Benefit [Line Items]
Total Current	10,282,000	11,682,000	10,380,000
Total Deferred	176,000	365,000	(528,000)
State
Schedule Of Income Tax Expense Benefit [Line Items]
Total Current	96,000	(202,000)	132,000
Total Deferred	206,000	63,000	(70,000)
Foreign
Schedule Of Income Tax Expense Benefit [Line Items]
Total Deferred	$ (96,000)	$ 0	$ 0

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.