Short-term Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands	Jan. 27, 2015 USD ($)	Nov. 24, 2014 USD ($)	Nov. 13, 2014 USD ($)	Mar. 31, 2015 USD ($)	Jan. 27, 2015 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 03, 2014 USD ($)	Dec. 03, 2014 CNY (¥)	Nov. 24, 2014 CNY (¥)	Nov. 13, 2014 CNY (¥)
Investments, All Other Investments [Abstract]
Short-term investments	$ 4,839	$ 19,358	$ 8,066	$ 27,424	¥ 30,000	$ 27,354			¥ 120,000	¥ 50,000
Short-term investment, estimated rate of return	4.00%	4.50%	5.00%
Short-term Debt				$ 61,637		$ 48,286	$ 5,646	¥ 35,000
Short term investment maturity period	61 days
61 Days maturity [Member]
Investments, All Other Investments [Abstract]
Short-term investments	$ 20,971				¥ 130,000
Short-term investment, estimated rate of return	4.00%