Financial Information of Registrant (Parent Company) (Detail 2) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net (loss) income	$ (3,545,000)	$ (333,000)	$ (19,899,000)	$ (5,505,000)	$ 287,000	$ (3,018,000)	$ 315,000	$ 486,000	$ (29,282,000)	$ (1,930,000)	$ 28,068,000
Equity in (income) loss of subsidiaries, net of tax									(427,000)	(396,000)	(85,000)
Stock-based compensation									207,000	144,000	185,000
Deferred income taxes									(16,176,000)	(917,000)	(19,223,000)
Other									108,000	261,000	224,000
Net cash (used in) provided by operating activities									(13,628,000)	29,307,000	27,009,000
Cash flows from investing activities:
Dividends from subsidiary									0
Net cash provided by (used in) investing activities									16,654,000	(46,240,000)	3,313,000
Cash flows from financing activities:
Proceeds from term loan from principal stockholder										30,000,000
Net proceeds from issuance of common stock									68,000	91,000	74,000
Net cash provided by financing activities									68,000	30,091,000	74,000
Parent Company
Cash flows from operating activities:
Net (loss) income									(29,282,000)	(1,930,000)	28,068,000
Equity in (income) loss of subsidiaries, net of tax									27,428,000	441,000	(23,804,000)
Stock-based compensation									207,000	144,000	185,000
Deferred income taxes									(17,179,000)	(684,000)	(7,871,000)
Other									95,000	(203,000)	28,000
Change in assets and liabilities									17,300,000	2,385,000	3,197,000
Net cash (used in) provided by operating activities									(1,431,000)	153,000	(197,000)
Cash flows from investing activities:
Dividends from subsidiary									1,225,000	2,025,000	7,425,000
Loan to wholly-owned subsidiary									6,400,000	(30,010,000)
Investments in subsidiaries									(10,900,000)	(10,000,000)	(44,000)
Net cash provided by (used in) investing activities									(3,275,000)	(37,985,000)	7,381,000
Cash flows from financing activities:
Proceeds from term loan from principal stockholder										30,000,000
Net proceeds from issuance of common stock									68,000	91,000	74,000
Net cash provided by financing activities									68,000	30,091,000	74,000
Net change in cash and cash equivalents									(4,638,000)	(7,741,000)	7,258,000
Cash and cash equivalents, beginning of period				$ 8,095,000				$ 15,836,000	8,095,000	15,836,000	8,578,000
Cash and cash equivalents, end of period	$ 3,457,000				$ 8,095,000				$ 3,457,000	$ 8,095,000	$ 15,836,000