The Company - Additional Information (Detail)		12 Months Ended
	Dec. 22, 2016 USD ($)	Dec. 31, 2016 USD ($) Segment
Disclosure Company Additional Information [Abstract]
Subscription agreement date		Dec. 22, 2016
Preferred stock purchased, value under subscription agreement	$ 4,500,000
Cost-method investments, carrying value		$ 4,500,000
Dividends paid		0
Amount paid withholding taxes in Canadian Revenue Agency		7,600,000
Income tax expense related to intercompany dividends		2,500,000
Accrued one-time income tax payment		$ 32,600,000
Number of reportable segments | Segment		2