Business Segments - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 125,969	$ 172,429	$ 209,411
Domestic
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	107,258	152,437	196,499
International
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 18,711	$ 19,992	$ 12,912