Acquisitions - Estimated Amortization Expense (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Remainder of 2015	$ 93
2016	372
2017	372
2018	372
2019	372
2020	372
Thereafter	1,975
Total	3,928	$ 4,212
Path Logic [Member]
Finite-Lived Intangible Assets [Line Items]
Remainder of 2015	37
2016	148
2017	148
2018	148
2019	148
2020	148
Thereafter	970
Total	$ 1,747