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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - SATTi (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 168,126us-gaap_Goodwill	$ 167,547us-gaap_Goodwill	$ 134,062us-gaap_Goodwill
SAT Technology, Inc. ("SAT") [Member]
Business Acquisition [Line Items]
Current assets	1,679
Property and equipment	10
Goodwill	1,733
Intangible - finite life, net	840
Intangible - indefinite life	260
Total assets acquired	4,522
Current liabilities assumed	(1,847)
Deferred tax liabilities	(275)
Net assets acquired	$ 2,400