Income Taxes - Components of Income Tax Expense Attributable to Continuing Operations (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
Income Tax Disclosure [Abstract]
Federal income tax expense, Current									$ 4,107	$ 4,520	$ 2,154
Federal income tax expense, Deferred									(809)	(1,643)	567
Federal income tax expense, Total									3,298	2,877	2,721
State income tax expense, Current									1,422	1,063	(47)
State income tax expense, Deferred									(321)	(500)	162
State income tax expense, Total									1,101	563	115
Income tax expense, Current									5,529	5,583	2,107
Income tax expense, Deferred									(1,130)	(2,143)	729
Income tax expense, Total	$ 1,433	$ 1,431	$ 757	$ 778	$ 526	$ 923	$ 857	$ 803	$ 4,399	$ 3,109	$ 2,444