Provisions for Federal and State Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Income Tax Provision
Federal	$ 0	$ 0	$ 0
State		3,530	(387)
Total Current Income Taxes		3,530	(387)
Deferred Income Provision
Federal	11,209	12,413	10,809
State	4,145	(500)	3,573
Total Deferred Income Taxes	15,354	11,913	14,382
Total Income Tax Expense	$ 15,354	$ 15,443	$ 13,995