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Common Shares - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Apr. 30, 2014
Dec. 31, 2013
Nov. 30, 2013
Equity [Abstract]        
Common stock, shares authorized 1,000,000,000us-gaap_CommonStockSharesAuthorized   195,504,449us-gaap_CommonStockSharesAuthorized  
Common stock, par value $ 0.00025us-gaap_CommonStockParOrStatedValuePerShare $ 0.00025us-gaap_CommonStockParOrStatedValuePerShare $ 0.00025us-gaap_CommonStockParOrStatedValuePerShare $ 0.00025us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares outstanding 327,611,487us-gaap_CommonStockSharesOutstanding   61,447,372us-gaap_CommonStockSharesOutstanding  
Treasury stock, shares 30,274,602us-gaap_TreasuryStockShares 14,195,412us-gaap_TreasuryStockShares 9,073,732us-gaap_TreasuryStockShares 9,073,732us-gaap_TreasuryStockShares
Common stock voting rights, description Each common share is entitled to one vote. The holders of common shares are also entitled to receive dividends whenever funds are legally available and when declared by the Board of Directors, which is subject to the approval by the holders of the common shares representing a majority of the aggregate voting power of all outstanding shares.