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Income Taxes - Provision for Federal and State Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal									$ 4,172	$ 2,753	$ 2,829
State									591	258	334
Deferred:
Federal									922	2,397	1,480
State									11	143	133
Provision for federal and state income taxes, total	$ 1,049	$ 1,400	$ 1,537	$ 1,710	$ 1,358	$ 1,842	$ 1,405	$ 946	$ 5,696	$ 5,551	$ 4,776

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

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

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

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