Equity-Based Compensation - Summary of Equity-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	$ 3,852	$ 3,750	$ 7,617	$ 8,407
Unrecognized equity-based compensation	15,110	22,348	15,110	22,348
Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	3,165	3,236	6,310	7,318
Unrecognized equity-based compensation	8,921	16,811	8,921	16,811
Subsidiaries
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	687	514	1,307	1,089
Unrecognized equity-based compensation	6,189	5,537	$ 6,189	5,537
Weighted Average Years Remaining of Equity-Based Compensation			2 years 8 months 1 day
DSUs \| Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	74	94	$ 148	193
Unrecognized equity-based compensation	282	578	$ 282	578
Weighted Average Years Remaining of Equity-Based Compensation			11 months 12 days
Restricted stock \| Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	3,081	3,092	$ 6,142	7,017
Unrecognized equity-based compensation	8,541	16,096	$ 8,541	16,096
Weighted Average Years Remaining of Equity-Based Compensation			10 months 15 days
SARs \| Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	10	50	$ 20	108
Unrecognized equity-based compensation	98	137	$ 98	137
Weighted Average Years Remaining of Equity-Based Compensation			2 years 9 months 26 days
Cost of revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	35	22	$ 137	54
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	100	72	192	160
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	3,552	3,554	7,041	7,977
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	$ 165	$ 102	$ 247	$ 216

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=96867065&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)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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No definition available.

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