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Employee Benefit Plans - Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plan [Line Items]
Net actuarial loss	$ (1,699)	$ (1,667)
Tax effect	595	583
Other comprehensive income (loss)	(1,063)	(1,084)	(981)	(632)
Employee Benefit Plan [Member]
Employee Benefit Plan [Line Items]
Other comprehensive income (loss)	$ (1,104)	$ (1,084)

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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