Capital Stock - Additional Information (Detail) (USD $)	0 Months Ended		9 Months Ended
	Jan. 16, 2014	Jan. 03, 2014	Jan. 31, 2014	Jan. 04, 2014	Dec. 31, 2013	Apr. 30, 2013
Class of Stock [Line Items]
Common stock, shares authorized		20,000,000,000,000	2,000,000,000	1,500,000,000		2,000,000,000
Capital stock, shares issued		18,607,793,610,000	77,519,484	46,519,484		46,519,484
Common stock, par value		$ 0.0001	$ 0.0001	$ 0.0001	$ 1	$ 0.0001
Common stock, shares canceled		19,998,500,000,000
Capital stock, increase in authorized amount		$ 50,000
Preferred stock, shares authorized		500,000,000		500,000,000
Preferred stock, par value (dollars per share)		$ 0.0001		$ 0.0001
Capital stock, authorized		200,000
Price of shares issued (in dollars per share)	$ 10.00
Issuance of capital stock	289,100,000		289,140,000
Underwriting expense paid	16,300,000
Initial public offering costs	4,600,000
Capital stock
Class of Stock [Line Items]
Capital stock, shares issued	31,000,000
Price of shares issued (in dollars per share)	$ 10.00
Issuance of capital stock	3,100		3,000
Contributed surplus
Class of Stock [Line Items]
Issuance of capital stock	$ 289,137,000		$ 289,137,000
Common Stock
Class of Stock [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		10,000
Stock repurchased and retired, shares		18,607,747,090,516