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Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Weighted Average Number of Shares Outstanding [Line Items]        
Weighted average common shares 41,236,554 33,779,141 36,435,591 33,485,448
Dilutive common stock options and restricted stock units 484,242 533,746 454,340 526,086
Dilutive effect of senior convertible notes 842,206 0 496,402 0
Weighted average common shares, assuming dilution 42,563,002 34,312,887 37,386,333 34,011,534