Current Prepaid Expenses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016
Short Term [Member] | Minimum [Member]
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]
Current prepaid expense recognition period - long term subscription projects	3 months
Short Term [Member] | Maximum [Member]
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]
Current prepaid expense recognition period - long term subscription projects	12 months
Long Term [Member] | Minimum [Member]
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]
Current prepaid expense recognition period - long term subscription projects	3 years
Long Term [Member] | Maximum [Member]
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]
Current prepaid expense recognition period - long term subscription projects	5 years