Net Income (Loss) per Share - Potentially Dilutive Securities Not Included in Computation of Diluted Net Loss Per Share (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
DSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the computation of diluted net loss per share (in shares)	34	90	23
Anti dilutive securities excluded from computation of earnings per share, weighted average price (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
SARs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the computation of diluted net loss per share (in shares)	308	480	548
Anti dilutive securities excluded from computation of earnings per share, weighted average price (in dollars per share)	$ 11.28	$ 10.67	$ 10.72
Restricted stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the computation of diluted net loss per share (in shares)	2,644	3,481	3,755
Anti dilutive securities excluded from computation of earnings per share, weighted average price (in dollars per share)	$ 0.00	$ 0.00	$ 0.00