Financial Information of Registrant (Parent Company) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Deferred tax asset	$ 35,641	$ 18,301
Other assets	6,078	6,950
TOTAL ASSETS	400,074	402,127
Liabilities:
Debentures payable	40,302	40,256
Term loan from principal stockholder	29,779	29,753
Other liabilities	10,476	15,606
Stockholders' equity	72,488	103,670	$ 106,964	$ 76,932
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	400,074	402,127
Parent Company
ASSETS
Investment in subsidiaries, at equity in net assets	112,479	132,430
Cash and cash equivalents	3,457	8,095	$ 15,836	$ 8,578
Loan to wholly-owned subsidiary	23,610	30,010
Deferred tax asset	25,828	8,649
Other assets	1,655	2,142
TOTAL ASSETS	167,029	181,326
Liabilities:
Debentures payable	40,302	40,256
Term loan from principal stockholder	29,779	29,753
Other liabilities	24,460	7,647
Stockholders' equity	72,488	103,670
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 167,029	$ 181,326