Geographic Information for Long-Lived Assets and Revenues in United States and other Countries (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-lived assets:
Long-lived assets	$ 543,838				$ 579,161				$ 543,838	$ 579,161	$ 489,403
Revenues:
Revenues	56,768	$ 75,807	$ 73,752	$ 73,747	167,798	$ 155,402	$ 176,561	$ 148,564	279,574	648,325	667,398
UNITED STATES
Long-lived assets:
Long-lived assets	531,518				561,109				531,518	561,109	454,031
Revenues:
Revenues									199,187	491,004	529,603
International
Long-lived assets:
Long-lived assets	$ 12,320				$ 18,052				12,320	18,052	35,372
CANADA
Revenues:
Revenues									33,614	73,092	43,329
Other International
Revenues:
Revenues									$ 46,773	$ 84,229	$ 94,466