Summary of Equity-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	$ 7,222us-gaap_ShareBasedCompensation	$ 3,876us-gaap_ShareBasedCompensation
Unrecognized Equity-Based Compensation	42,705
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	6,655	3,293
Unrecognized Equity-Based Compensation	37,632
Weighted Average Years Remaining of Equity-Based Compensation	2 years 1 month 2 days
SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	147	250
Unrecognized Equity-Based Compensation	386
Weighted Average Years Remaining of Equity-Based Compensation	1 year 3 months 26 days
DSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	17	146
Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	6,819	3,689
Unrecognized Equity-Based Compensation	38,018
Subsidiaries
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	403	187
Unrecognized Equity-Based Compensation	4,687
Weighted Average Years Remaining of Equity-Based Compensation	3 years 22 days
Cost of revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	26	19
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	58	41
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	7,093	3,788
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation	$ 45	$ 28

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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