Computation of Earnings (Loss) Per Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares used in basic per share calculation (in shares)	33,500	32,541	33,351	32,632
Shares used in diluted per share calculation (in shares)	33,500	32,541	34,295	32,632
Shares excluded from calculation of diluted (loss) earnings per share ("EPS")	1,100			700
Equity Option and Restricted Stock [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive stock options and restricted stock units (in shares)	0	0	944	0
Stock options [Member]
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation of diluted (loss) earnings per share ("EPS")	1,291	3,240	1,465	3,166