Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Operating lease expiration	Mar. 31, 2026
Rental expense	$ 4.3	$ 4.3	$ 5.2
Service purchase commitment, description	The Company has service agreements with certain major telecommunications service providers, where it has committed to purchase a minimum amount of services through September 2018. Additionally, the Company has contractual commitments with third parties to purchase network circuits through August 2020.

Describes the terms of a significant arrangement with a supplier (excluding an unconditional purchase obligation) to acquire goods or services over a period of time beyond one year or the normal operating cycle, if longer, which may include identification of the goods or services to be purchased, pricing, effects on pricing of failing to reach minimum quantities required to be purchased, cancellation rights, and termination provisions.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration