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Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 25, 2015
Mar. 31, 2015
Dec. 31, 2015
Significant Accounting Policies [Line Items]      
Stock split, stock conversion ratio 2 1  
Short-term investments maturity period     Less than three months
Estimated useful lives of definite-lived intangible assets     5 years
Changes in assumptions and experience gains and losses     Greater than 10%
Period of benefit obligation in current liabilities     Next twelve months
Minimum [Member] | Building [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     2.50%
Minimum [Member] | General Purpose Equipment [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     7.00%
Minimum [Member] | Special Purpose Equipment [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     10.00%
Maximum [Member] | Building [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     5.00%
Maximum [Member] | General Purpose Equipment [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     10.00%
Maximum [Member] | Special Purpose Equipment [Member]      
Significant Accounting Policies [Line Items]      
Annual rates of depreciation on fixed assets     33.00%