Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Maximum maturity period for classification of investments as cash equivalents	3 months
Investments other-than-temporary losses	$ 0	$ 0
Term of agreement for revenue recognition	2 years
Other comprehensive income	$ (7,279,000)		$ (5,229,000)
Deferred tax assets, net	5,197,000		9,229,000
Prepaid expenses and other assets	12,844,000		$ 9,880,000
Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Other comprehensive income	2,100,000
Deferred tax assets, net	3,100,000
Prepaid expenses and other assets	$ 1,000,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Contractual maturities accounts receivable	1 year
Estimated useful life of fixed assets	7 years
Maximum [Member] | Business Combinations [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets	15 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of fixed assets	3 years
Minimum [Member] | Business Combinations [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets	3 years
Minimum [Member] | Internally Developed Software [Member]
Significant Accounting Policies [Line Items]
Estimated life of intangible assets	3 years