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Additional Information Related to Equity-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost of Revenue	$ 8,091us-gaap_CostOfRevenue	$ 5,911us-gaap_CostOfRevenue	$ 5,519us-gaap_CostOfRevenue	$ 4,899us-gaap_CostOfRevenue	$ 4,935us-gaap_CostOfRevenue	$ 4,501us-gaap_CostOfRevenue	$ 4,123us-gaap_CostOfRevenue	$ 4,198us-gaap_CostOfRevenue	$ 24,420us-gaap_CostOfRevenue	$ 17,757us-gaap_CostOfRevenue	$ 9,459us-gaap_CostOfRevenue
Sales and marketing	10,876us-gaap_SellingAndMarketingExpense	10,718us-gaap_SellingAndMarketingExpense	9,585us-gaap_SellingAndMarketingExpense	8,531us-gaap_SellingAndMarketingExpense	8,335us-gaap_SellingAndMarketingExpense	7,571us-gaap_SellingAndMarketingExpense	6,541us-gaap_SellingAndMarketingExpense	5,682us-gaap_SellingAndMarketingExpense	39,710us-gaap_SellingAndMarketingExpense	28,129us-gaap_SellingAndMarketingExpense	12,355us-gaap_SellingAndMarketingExpense
General and administrative	15,009us-gaap_GeneralAndAdministrativeExpense	13,798us-gaap_GeneralAndAdministrativeExpense	12,915us-gaap_GeneralAndAdministrativeExpense	10,009us-gaap_GeneralAndAdministrativeExpense	7,085us-gaap_GeneralAndAdministrativeExpense	7,852us-gaap_GeneralAndAdministrativeExpense	7,220us-gaap_GeneralAndAdministrativeExpense	8,803us-gaap_GeneralAndAdministrativeExpense	51,731us-gaap_GeneralAndAdministrativeExpense	30,960us-gaap_GeneralAndAdministrativeExpense	28,408us-gaap_GeneralAndAdministrativeExpense
Research and development	4,648us-gaap_ResearchAndDevelopmentExpense	3,960us-gaap_ResearchAndDevelopmentExpense	3,547us-gaap_ResearchAndDevelopmentExpense	3,253us-gaap_ResearchAndDevelopmentExpense	2,306us-gaap_ResearchAndDevelopmentExpense	2,149us-gaap_ResearchAndDevelopmentExpense	2,331us-gaap_ResearchAndDevelopmentExpense	2,246us-gaap_ResearchAndDevelopmentExpense	15,408us-gaap_ResearchAndDevelopmentExpense	9,032us-gaap_ResearchAndDevelopmentExpense	8,807us-gaap_ResearchAndDevelopmentExpense
Equity-Based Compensation									23,889us-gaap_ShareBasedCompensation	6,411us-gaap_ShareBasedCompensation	6,236us-gaap_ShareBasedCompensation
Equity-based compensation									23,889us-gaap_ShareBasedCompensation	6,411us-gaap_ShareBasedCompensation	6,236us-gaap_ShareBasedCompensation
Unrecognized Equity-Based Compensation	40,215								40,215
Weighted Average Years Remaining of Equity-Based Compensation
DSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation									444	377	419
Equity-based compensation									444	377	419
Unrecognized Equity-Based Compensation	17								17
Weighted Average Years Remaining of Equity-Based Compensation									15 days
SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation									792	2,377	2,488
Equity-based compensation									792	2,377	2,488
Unrecognized Equity-Based Compensation	519								519
Weighted Average Years Remaining of Equity-Based Compensation									1 year 4 months 2 days
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation									21,818	2,958	2,871
Equity-based compensation									21,818	2,958	2,871
Unrecognized Equity-Based Compensation	37,780								37,780
Weighted Average Years Remaining of Equity-Based Compensation									2 years 5 months 1 day
Parent Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation									23,054	5,712	5,778
Equity-based compensation									23,054	5,712	5,778
Unrecognized Equity-Based Compensation	38,316								38,316
Subsidiaries
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-Based Compensation									835	699	458
Equity-based compensation									835	699	458
Unrecognized Equity-Based Compensation	1,899								1,899
Weighted Average Years Remaining of Equity-Based Compensation									1 year 7 months 17 days
Cost of revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cost of Revenue									76	63	7
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sales and marketing									160	156	18
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
General and administrative									23,509	6,081	6,195
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Research and development									$ 144	$ 111	$ 16