Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Type (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock Based Compensation [Line Items]
Total	$ 661	$ 944	$ 2,507	$ 3,187
Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	661	978	2,458	3,069
Discontinued Operations [Member]
Stock Based Compensation [Line Items]
Total	0	(34)	49	118
Service Based Restricted Stock [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	612	640	2,291	2,368
Employee Stock Purchase Plan [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	50	40	138	125
Stock Options [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	(1)	34	29	145
Stock Bonuses [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	$ 0	$ 264	$ 0	$ 431