Asset Impairment Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Asset Impairment Charges [Line Items]
Asset impairment charges	$ 0	$ 0	$ 0	$ 4,650	$ 1,203	$ 22	$ 293	$ 26	$ 4,650	$ 1,544	$ 2,390
Other charges									400
Wrote-off certain deferred costs										300	800
Commercial Agreement[Member]
Asset Impairment Charges [Line Items]
Asset impairment charges										$ 1,200
Capitalized Software Development Projects [Member]
Asset Impairment Charges [Line Items]
Asset impairment charges									2,200		$ 1,600
Cost Method Equity Investments
Asset Impairment Charges [Line Items]
Asset impairment charges									$ 2,100