Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Leases [Abstract]
2015	$ 3,419
2016	2,510
2017	1,856
2018	1,323
2019	859
Thereafter	1,180
Future minimum lease payments	$ 11,147