Property and Equipment - Summary of Internally Developed Capitalized Software (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross Carrying Amount, Beginning Balance	$ 41,823
Disposals	(3,700)	$ (13,200)
Gross Carrying Amount, Ending Balance	40,449	41,823
Accumulated Depreciation, Beginning Balance	(28,385)
Disposals	1,000	1,600
Depreciation expense	(6,238)	(5,977)
Accumulated Depreciation, Ending Balance	(29,591)	(28,385)
Net Carrying Amount, Beginning Balance	13,438
Net Carrying Amount, Ending Balance	10,611	13,438
Depreciation Expense Related to Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Gross Carrying Amount, Beginning Balance	14,582	13,754
Additions	5,179	7,810
Disposals	(606)	(6,982)
Impairment	(4,140)
Gross Carrying Amount, Ending Balance	15,015	14,582
Accumulated Depreciation, Beginning Balance	(6,880)	(11,169)
Disposals	434	6,982
Depreciation expense	(3,742)	(2,693)
Impairment	2,257
Accumulated Depreciation, Ending Balance	(7,931)	(6,880)
Net Carrying Amount, Beginning Balance	7,702	2,585
Disposals	(172)
Impairment	(1,883)
Net Carrying Amount, Ending Balance	$ 7,084	$ 7,702