Prior Periods Financial Statement Revision - Schedule of Correction of Misstatements on Consolidated Statements of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Changes And Error Corrections [Line Items]
Net income (loss)	$ 163,052	$ 6,663	$ (6,486)
Retained earnings	211,080	55,175	56,096
Change in fair value of interest rate swap		1,910	(1,637)
Foreign currency translation loss	22,094	(10,623)	(24,903)
Accumulated other comprehensive loss	(17,745)	(30,596)	(21,883)
Additional paid-in capital	292,494	284,508	277,917
Total stockholders' equity	$ 486,104	309,391	312,431	$ 172,989
As Previously Reported [Member]
Accounting Changes And Error Corrections [Line Items]
Net income (loss)		7,942	(7,431)
Retained earnings		55,509	55,151
Change in fair value of interest rate swap		3,015	(2,584)
Foreign currency translation loss		(8,984)	(21,936)
Accumulated other comprehensive loss		(25,122)	(19,153)
Additional paid-in capital			277,582
Total stockholders' equity		315,199	313,881
Adjustment [Member]
Accounting Changes And Error Corrections [Line Items]
Net income (loss)		(1,279)	945
Retained earnings		(334)	945
Change in fair value of interest rate swap		(1,105)	947
Foreign currency translation loss		(1,639)	(2,967)
Accumulated other comprehensive loss		(5,474)	(2,730)
Additional paid-in capital			335
Total stockholders' equity		$ (5,808)	$ (1,450)