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Capital Stock - Additional Information (Detail) - Employees of former affliate [Member] - Employee Stock Option [Member]
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Equity [Line Items]  
Options to purchase shares of common stock 501,000
Exercisable at end of period, Weighted Average Remaining Contractual Term 1 year
Weighted average exercise price | $ / shares $ 28.62
Aggregate intrinsic value | $ $ 0